Jesse Burgess Thomas was an American lawyer, judge and politician who served as a delegate from the Indiana Territory to the tenth Congress and later served as president of the Constitutional Convention which led to Illinois being admitted to the Union. He became one of Illinois' first two Senators, and is best known as the author of the Missouri Compromise of 1820. After his retirement from the U.S. Senate in 1829 he lived the rest of his life in Ohio.

The Indiana Territory, officially the Territory of Indiana, was created by an organic act that President John Adams signed into law on May 7, 1800, to form an organized incorporated territory of the United States that existed from July 4, 1800, to December 11, 1816, when the remaining southeastern portion of the territory was admitted to the Union as the state of Indiana. The territory originally contained approximately 259,824 square miles (672,940 km2) of land, but its size was decreased when it was subdivided to create the Michigan Territory (1805) and the Illinois Territory (1809). The Indiana Territory was the first new territory created from lands of the Northwest Territory, which had been organized under the terms of the Northwest Ordinance of 1787. The territorial capital was the settlement around the old French fort of Vincennes on the Wabash River, until transferred to Corydon near the Ohio River in 1813.