Legality of Cannabis by U.S. Jurisdiction Illinois portalUnited States portalHistory portal This category is for topics specifically related to the year 1831 in the U.S. state of Illinois. 18261827182818291830183118321833183418351836 1780s1790s1800s1810s1820s1830s1840s1850s1860s1870s1880s Subcategories This category has the following 2 subcategories, out of 2 total. / 1831 establishments in Illinois (12 P)E 1831 Illinois elections (2 P)