 When the Indiana Territory was established in 1800 its total white population was 5,641; however, its Native American population was estimated to be nearly 20,000, but may have been as high as 75,000.Indiana Territory initially comprised most of the present-day state Indiana excluding a narrow strip of land along the eastern border called "The Gore" (ceded by Ohio in 1803), all of the present-day states of Illinois and Wisconsin, and parts of present-day Michigan and Minnesota.The Indiana Territory's boundary was further reduced in 1805 with the creation of the Michigan Territory to the north and again in 1809 when the Illinois Territory was established to the west.