Legality of Cannabis by U.S. Jurisdiction Idaho portalUnited States portalHistory portal This category is for topics specifically related to the year 1915 in the U.S. state of Idaho. 19101911191219131914191519161917191819191920 1860s1870s1880s1890s1900s1910s1920s1930s1940s1950s1960s Subcategories This category has the following 2 subcategories, out of 2 total. / 1915 establishments in Idaho (13 P)S 1915 in sports in Idaho (1 P)