How many years has Indiana been part of the US?

Answer 1

Indiana was admitted to the Union in 1816, so as of 2011 it has been a state for 195 years.

Before admission as a state, it was the Indiana Territory from 1800-1816, although large portions were broken off in 1805 to create the Michigan Territory and in 1809 to create the Illinois Territory. Before 1800, it was part of the Northwest Territory, which was created as an organized unincorporated territory of the United States in 1787.

Before that , it was part of the Indian Reserve, a territory under British rule set aside in the Royal Proclamation of 1763 for use by American Indians, which was assigned to the United States in the Treaty of Paris in 1783

So the land that is now Indiana has been part of the US at least since 1783 (228 years). Of course, that territory was fought over, and settled by, the colonials during the Revolution, so one might argue for an earlier date.