The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America. It is a federation of 50 states, a federal capital district (Washington, D.C.), and 326 Indian reservations. Outside the union of states, it asserts sovereignty over five major unincorporated island territories and various uninhabited islands. The country has the world's third-largest land area, second-largest exclusive economic zone, and third-largest population, exceeding 334 million.

Paleo-Indians migrated across the Bering land bridge more than 12,000 years ago. British colonization led to the first settlement of the Thirteen Colonies in Virginia in 1607. Clashes with the British Crown over taxation and political representation sparked the American Revolution, with the Second Continental Congress formally declaring independence on July 4, 1776. Following its victory in the Revolutionary War (1775–1783), the country continued to expand across North America. As more states were admitted, sectional division over slavery led to the secession of the Confederate States of America, which fought the remaining states of the Union during the 1861–1865 American Civil War. With the Union's victory and preservation, slavery was abolished nationally. By 1890, the United States had established itself as a great power. After Japan's attack on Pearl Harbor in December 1941, the U.S. entered World War II. The aftermath of the war left the U.S. and the Soviet Union as the world's two superpowers and led to the Cold War, during which both countries engaged in a struggle for ideological dominance and international influence. Following the Soviet Union's collapse and the end of the Cold War in 1991, the U.S. emerged as the world's sole superpower.

The U.S. national government is a presidential constitutional republic and liberal democracy with three separate branches: legislative, executive, and judicial. It has a bicameral national legislature composed of the House of Representatives, a lower house based on population; and the Senate, an upper house based on equal representation for each state. Substantial autonomy is given to states and several territories, with a political culture that emphasizes liberty, equality under the law, individualism, and limited government. (Full article...)

India, officially the Republic of India (ISO: Bhārat Gaṇarājya), is a country in South Asia. It is the seventh-largest country by area; the most populous country as of June 2023; and from the time of its independence in 1947, the world's most populous democracy. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north; and Bangladesh and Myanmar to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; its Andaman and Nicobar Islands share a maritime border with Thailand, Myanmar, and Indonesia.

Modern humans arrived on the Indian subcontinent from Africa no later than 55,000 years ago.
Their long occupation, initially in varying forms of isolation as hunter-gatherers, has made the region highly diverse, second only to Africa in human genetic diversity. Settled life emerged on the subcontinent in the western margins of the Indus river basin 9,000 years ago, evolving gradually into the Indus Valley Civilisation of the third millennium BCE.
By 1200 BCE, an archaic form of Sanskrit, an Indo-European language, had diffused into India from the northwest. Its evidence today is found in the hymns of the Rigveda. Preserved by an oral tradition that was resolutely vigilant, the Rigveda records the dawning of Hinduism in India. The Dravidian languages of India were supplanted in the northern and western regions.
By 400 BCE, stratification and exclusion by caste had emerged within Hinduism,
and Buddhism and Jainism had arisen, proclaiming social orders unlinked to heredity.
Early political consolidations gave rise to the loose-knit Maurya and Gupta Empires based in the Ganges Basin.
Their collective era was suffused with wide-ranging creativity, but also marked by the declining status of women, and the incorporation of untouchability into an organised system of belief. In South India, the Middle kingdoms exported Dravidian-languages scripts and religious cultures to the kingdoms of Southeast Asia.

In the early medieval era, Christianity, Islam, Judaism, and Zoroastrianism became established on India's southern and western coasts.
Muslim armies from Central Asia intermittently overran India's northern plains,
eventually founding the Delhi Sultanate, and drawing northern India into the cosmopolitan networks of medieval Islam.
In the 15th century, the Vijayanagara Empire created a long-lasting composite Hindu culture in south India.
In the Punjab, Sikhism emerged, rejecting institutionalised religion.
The Mughal Empire, in 1526, ushered in two centuries of relative peace,
leaving a legacy of luminous architecture.
Gradually expanding rule of the British East India Company followed, turning India into a colonial economy, but also consolidating its sovereignty. British Crown rule began in 1858. The rights promised to Indians were granted slowly, but technological changes were introduced, and modern ideas of education and the public life took root. A pioneering and influential nationalist movement emerged, which was noted for nonviolent resistance and became the major factor in ending British rule. In 1947 the British Indian Empire was partitioned into two independent dominions, a Hindu-majority Dominion of India and a Muslim-majority Dominion of Pakistan, amid large-scale loss of life and an unprecedented migration. (Full article...)

Haiti, officially the Republic of Haiti, is a country on the island of Hispaniola in the Caribbean Sea, east of Cuba and Jamaica, and south of The Bahamas. It occupies the western three-eighths of the island which it shares with the Dominican Republic. Haiti is 27,750 km² (10,714 sq mi), the third largest country in the Caribbean, and has an estimated population of 11.4 million,0 making it the most populous Caribbean country. The capital is Port-au-Prince.

The island was originally inhabited by the Taíno people. The first Europeans arrived in December 1492 during the first voyage of Christopher Columbus. Columbus founded the first European settlement in the Americas, La Navidad, on what is now the northeastern coast of Haiti. The island was claimed by Spain, forming part of the Spanish Empire until the early 17th century. Competing claims and settlements led to the west of the island being ceded to France in 1697, which was subsequently named Saint-Domingue. French colonists established sugarcane plantations, worked by enslaved persons brought from Africa, which made the colony one of the world's richest.

In the midst of the French Revolution, enslaved persons, maroons, and free people of color launched the Haitian Revolution (1791–1804), led by a former slave and general of the French Army, Toussaint Louverture. Napoleon's forces were defeated by Louverture's successor, Jean-Jacques Dessalines (later Emperor Jacques I), who declared Haiti's sovereignty on 1 January 1804, leading to a massacre of the French. The country became the first independent nation of the Caribbean, the second republic in the Americas, the first country in the Americas to officially abolish slavery, and only country established by a slave revolt. President Jean-Pierre Boyer decided to invade and occupy Santo Domingo in February 1822, which eventually led to the long Haitian–Dominican war. Defeated, Haiti recognized Dominican independence in 1867, following their declaration in 1844. Haiti's first century of independence was characterized by political instability, ostracism by the international community, payment of a crippling debt to France and the vast cost of the war and the occupation of Santo Domingo. Political volatility and foreign economic influence prompted the US to occupy the country between 1915 and 1934. The last contingent of US Marines departed on August 15, 1934, after a formal transfer of authority to the Garde and Haïti regained its independence. François 'Papa Doc' Duvalier took power in 1957, ushering in a long period of autocratic rule continued by his son, Jean-Claude 'Baby Doc' Duvalier, that lasted until 1986; the period was characterized by state-sanctioned violence against the opposition and civilians, corruption, and economic stagnation. The country endured a 2004 coup d'état, which prompted U.N. intervention, as well as a catastrophic earthquake in 2010 that killed over 250,000 people and a cholera outbreak. Many countries canceled Haiti's debt, including France and the United States. With its deteriorating economic situation, Haiti has experienced a socioeconomic and political crisis marked by riots and protests, widespread hunger, and increased gang activity. As of February 2023, Haiti has no remaining elected government officials and has been described as a failed state. (Full article...)

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of the continental mainland. It comprises England, Scotland, Wales, and Northern Ireland. It includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of the smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea, and the Irish Sea. The total area of the United Kingdom is 94,354 square miles (244,376 km²), with an estimated population of nearly 67.6 million people in 2022.

In 1707, the Kingdom of England (which included Wales) and the Kingdom of Scotland united under the Treaty of Union to create the Kingdom of Great Britain. The Acts of Union 1800 incorporated the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland in 1801. Most of Ireland seceded from the UK in 1922 as the Irish Free State, and the Royal and Parliamentary Titles Act 1927 created the present name, the United Kingdom of Great Britain and Northern Ireland.

The UK became the first industrialised country and was the world's foremost power for the majority of the 19th and early 20th centuries, particularly during the "Pax Britannica" between 1815 and 1914. At its height in the 1920s, the British Empire encompassed almost a quarter of the world's landmass and population, and was the largest empire in history. However, its involvement in the First World War and the Second World War damaged Britain's economic power and a global wave of decolonisation led to the independence of most British colonies. British influence can be observed in the legal and political systems of many of its former colonies, and British culture remains globally influential, particularly in language, literature, music and sport. English is the world's most widely spoken language and the third-most spoken native language. (Full article...)

Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the largest country in the world by area, extending across eleven time zones and sharing land borders with fourteen countries. It is the world's ninth-most populous country and Europe's most populous country. The country's capital as well as its largest city is Moscow. Saint Petersburg is Russia's second-largest city and cultural capital. Other major cities in the country include Novosibirsk, Yekaterinburg, Nizhny Novgorod, Chelyabinsk, Krasnoyarsk, Kazan, Krasnodar and Rostov-on-Don.

The East Slavs emerged as a recognised group in Europe between the 3rd and 8th centuries CE. The first East Slavic state, Kievan Rus', arose in the 9th century, and in 988, it adopted Orthodox Christianity from the Byzantine Empire. Rus' ultimately disintegrated, with the Grand Duchy of Moscow growing to become the Tsardom of Russia. By the early 18th century, Russia had vastly expanded through conquest, annexation, and the efforts of Russian explorers, developing into the Russian Empire, which remains the third-largest empire in history. However, with the Russian Revolution in 1917, Russia's monarchic rule was abolished and eventually replaced by the Russian SFSR—the world's first constitutionally socialist state. Following the Russian Civil War, the Russian SFSR established the Soviet Union with three other Soviet republics, within which it was the largest and principal constituent. At the expense of millions of lives, the Soviet Union underwent rapid industrialisation in the 1930s and later played a decisive role for the Allies in World War II by leading large-scale efforts on the Eastern Front. With the onset of the Cold War, it competed with the United States for global ideological influence. The Soviet era of the 20th century saw some of the most significant Russian technological achievements, including the first human-made satellite and the first human expedition into outer space.

In 1991, the Russian SFSR emerged from the dissolution of the Soviet Union as the independent Russian Federation. A new constitution was adopted, which established a federal semi-presidential system. Since the turn of the century, Russia's political system has been dominated by Vladimir Putin, under whom the country has experienced democratic backsliding and a shift towards authoritarianism. Russia has been militarily involved in a number of conflicts in former Soviet states and other countries, including its war with Georgia in 2008 and annexation of Crimea in 2014 from neighbouring Ukraine, followed by the further annexation of four other regions in 2022 during an ongoing invasion. (Full article...)

Singapore, officially the Republic of Singapore, is an island country and city-state in maritime Southeast Asia. It is located about one degree of latitude (137 kilometres or 85 miles) north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south along with the Riau Islands in Indonesia, the South China Sea to the east, and the Straits of Johor along with the State of Johor in Malaysia to the north. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet; the combined area of these has increased by approximately 25% since the country's independence as a result of extensive land reclamation projects. It has the second highest population density of any country in the world, although there are numerous green and recreational spaces as a result of urban planning. With a multicultural population and in recognition of the cultural identities of the major ethnic groups within the nation, Singapore has four official languages: English, Malay, Mandarin, and Tamil. English is the lingua franca, with its exclusive use in numerous public services. Multi-racialism is enshrined in the constitution and continues to shape national policies in education, housing, and politics.

Singapore's history dates back at least eight hundred years, having been a maritime emporium known as Temasek and subsequently a major constituent part of several successive thalassocratic empires. Its contemporary era began in 1819, when Stamford Raffles established Singapore as an entrepôt trading post of the British Empire. In 1867, the colonies in Southeast Asia were reorganised, and Singapore came under the direct control of Britain as part of the Straits Settlements. During World War II, Singapore was occupied by Japan in 1942 and returned to British control as a separate Crown colony following Japan's surrender in 1945. Singapore gained self-governance in 1959 and, in 1963, became part of the new federation of Malaysia, alongside Malaya, North Borneo, and Sarawak. Ideological differences, most notably the perceived encroachment of the egalitarian "Malaysian Malaysia" political ideology led by Lee Kuan Yew into the other constituent entities of Malaysia—at the perceived expense of the bumiputera and the policies of Ketuanan Melayu—eventually led to Singapore's expulsion from the federation two years later; Singapore became an independent sovereign country in 1965.

After early years of turbulence and despite lacking natural resources and a hinterland, the nation rapidly developed to become one of the Four Asian Tigers. With its growth based on international trade and economic globalisation, it integrated itself with the world economy through free trade with minimal-to-no trade barriers or tariffs, export-oriented industrialisation, and the large accumulation of received foreign direct investments, foreign exchange reserves, and assets held by sovereign wealth funds. As a highly developed country, it has one of the highest GDP per capita (PPP) in the world. Identified as a tax haven, Singapore is the only country in Asia with a AAA sovereign credit rating from all major rating agencies. It is a major aviation, financial, and maritime shipping hub and has consistently been ranked as one of the most expensive cities to live in for expatriates and foreign workers. Singapore ranks highly in key social indicators: education, healthcare, quality of life, personal safety, infrastructure, and housing, with a home-ownership rate of 88 percent. Singaporeans enjoy one of the longest life expectancies, fastest Internet connection speeds, lowest infant mortality rates, and lowest levels of corruption in the world. (Full article...)

China, officially the People's Republic of China (PRC), is a country in East Asia. With a population exceeding 1.4 billion, it is the world's second-most populous country. China spans the equivalent of five time zones and borders fourteen countries by land. With an area of nearly 9.6 million square kilometers (3,700,000 sq mi), it is the third-largest country by total land area. The country is divided into 33 province-level divisions, inclusive of 22 provinces, five autonomous regions, four municipalities, and two semi-autonomous special administrative regions. Beijing is the national capital, while Shanghai is its most populous city and largest financial center.

One of the cradles of civilization, China has been inhabited since the Paleolithic era, with the earliest dynasties emerging in the Yellow River basin before the late second millennium BCE. The eighth to third centuries BCE saw a breakdown in the authority of the Zhou dynasty, accompanied by the emergence of administrative and military techniques, literature, philosophy, and historiography. In 221 BCE, China was unified under an emperor for the first time. Appointed non-hereditary officials began ruling counties instead of the aristocracy, ushering in more than two millennia of imperial dynasties including the Qin, Han, Tang, Yuan, Ming, and Qing. With the invention of gunpowder and paper, the establishment of the Silk Road, and the building of the Great Wall, Chinese culture—including languages, traditions, architecture, philosophy and technology—flourished and has heavily influenced East Asia and beyond.

After decades of struggle, the monarchy was overthrown in 1912 and the Republic of China (ROC) was established. Despite China's eventual victory in the Second Sino-Japanese War and the Pacific War in general, numerous atrocities such as the Nanjing Massacre left lasting effects on the country. Concurrently during this period, the Chinese Communist Party (CCP) and the Kuomintang (KMT) government were fighting sporadically since 1927, with a brief truce as a united front when Japan began invading the country. The second phase of the civil war resumed not long after Japan was defeated, and by 1949, the CCP had established control on most of the territories of the country. As the KMT retreated to Taiwan, the country was split with both sides claiming to be the sole legitimate government of China. After the land reforms, later attempts to realize communism failed—the Great Leap Forward led to a massive famine of millions of citizens, while the Cultural Revolution caused a chaotic period of persecution and zealous Maoist populism. In 1971, the PRC replaced the ROC as China's representation in the United Nations (UN). Following the Sino-Soviet split, the Shanghai Communiqué in 1972 marked the beginning of normalized relations with the United States. Economic reforms that began in 1978 led by reformists within the CCP moved the country away from a socialist planned economy toward an increasingly capitalist market economy, spurring significant economic growth, although liberal and democratic political reforms stalled after the June Fourth Incident in 1989. (Full article...)

Japan is an island country in East Asia. It is in the northwest Pacific Ocean and is bordered on the west by the Sea of Japan, extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans an archipelago of 14,125 islands, with the five main islands being Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa. Tokyo is the country's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto.

Japan has over 125 million inhabitants and is the 11th most populous country in the world, as well as one of the most densely populated. About three-fourths of the country's terrain is mountainous, concentrating its highly urbanized population on narrow coastal plains. Japan is divided into 47 administrative prefectures and eight traditional regions. The Greater Tokyo Area is the most populous metropolitan area in the world. Japan has the world's highest life expectancy, although it is experiencing a population decline due to its very low birth rate.

Japan has been inhabited since the Upper Paleolithic period (30,000 BC). Between the fourth and ninth centuries AD, the kingdoms of Japan became unified under an emperor and the imperial court based in Heian-kyō. Beginning in the 12th century, political power was held by a series of military dictators (shōgun) and feudal lords (daimyō), and enforced by a class of warrior nobility (samurai). After a century-long period of civil war, the country was reunified in 1603 under the Tokugawa shogunate, which enacted an isolationist foreign policy. In 1854, a United States fleet forced Japan to open trade to the West, which led to the end of the shogunate and the restoration of imperial power in 1868. In the Meiji period, the Empire of Japan adopted a Western-modeled constitution, and pursued a program of industrialization and modernization. Amidst a rise in militarism and overseas colonization, Japan invaded China in 1937 and entered World War II as an Axis power in 1941. After suffering defeat in the Pacific War and two atomic bombings, Japan surrendered in 1945 and came under a seven-year Allied occupation, during which it adopted a new constitution. (Full article...)

Israel, officially the State of Israel, is a country in the Southern Levant region of West Asia. It is bordered by Lebanon to the north, Syria to the northeast, Jordan to the east, the Red Sea to the south, Egypt to the southwest, the Mediterranean Sea to the west, and the Palestinian territories – the West Bank along the east and the Gaza Strip along the southwest. Tel Aviv is the financial, economic, and technological center of the country, while its seat of government is in its proclaimed capital of Jerusalem, although Israeli sovereignty over East Jerusalem is unrecognized internationally.

Israel is located in a region known historically as Canaan, Palestine, and the Holy Land. In antiquity, it was home to several Canaanite, and later, Israelite and Judahite states, and is referred to as the Land of Israel in Jewish tradition. The region was successively conquered by the Assyrian, Babylonian, Achaemenid, Hellenistic, Roman and Byzantine empires, Arab Caliphates, Crusaders, Ayyubids, Mamluks and Ottomans. The late 19th century saw the rise of Zionism in Europe, a movement seeking a Jewish homeland, which garnered British support during World War I. During the war, the Ottomans were defeated and the British Mandate for Palestine was set up in 1920. Jewish immigration to Mandatory Palestine increased considerably, leading to intercommunal conflict between Jews and Arabs. The 1947 UN Partition Plan triggered a civil war between the two groups, which saw the expulsion and flight of most of Palestine's predominantly Arab population.

The State of Israel declared its establishment on 14 May 1948, the day the British terminated the Mandate. On 15 May 1948, the armies of neighboring Arab states invaded the area of the former Mandatory Palestine, starting the First Arab–Israeli War. The 1949 Armistice Agreements saw Israel's borders established over most of the former Mandate territory, while the rest, the West Bank and the Gaza Strip, were taken by Jordan and Egypt respectively. The 1967 Six-Day War saw Israel occupying the West Bank, the Gaza Strip, the Egyptian Sinai Peninsula and the Syrian Golan Heights. It has since established and continues to expand settlements across the occupied territories, actions which are deemed illegal under international law, and annexed both East Jerusalem and the Golan Heights, which are largely unrecognized internationally. Since the 1973 Yom Kippur War, Israel has signed peace treaties with Egypt, returning the Sinai Peninsula, and with Jordan, and more recently normalized relations with several Arab countries. However, efforts to resolve the Israeli–Palestinian conflict have not succeeded. Israel's practices in its occupation of the Palestinian territories have drawn sustained international criticism along with accusations that it has committed war crimes and crimes against humanity against the Palestinian people from human rights organizations and United Nations officials. (Full article...)

Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates. Nominal GDP does not take into account differences in the cost of living in different countries, and the results can vary greatly from one year to another based on fluctuations in the exchange rates of the country's currency. Such fluctuations may change a country's ranking from one year to the next, even though they often make little or no difference in the standard of living of its population.

Comparisons of national wealth are also frequently made based on purchasing power parity (PPP), to adjust for differences in the cost of living in different countries. Other metrics, nominal GDP per capita and a corresponding GDP (PPP) per capita are used for comparing national standard of living. On the whole, PPP per capita figures are less spread than nominal GDP per capita figures.

The rankings of national economies over time have changed considerably; the United States surpassed the British Empire's output around 1916, which in turn had surpassed the Qing dynasty in aggregate output decades earlier. Since China's transition to a socialist market economy through controlled privatisation and deregulation, the country has seen its ranking increase from ninth in 1978, to second in 2010; China's economic growth accelerated during this period and its share of global nominal GDP surged from 2% in 1980 to 18% in 2021. Among others, India has also experienced an economic boom since the implementation of economic liberalisation in the early 1990s. (Full article...)