Multiple Native American groups occupied Iowa Territory before the Louisiana purchase in 1803, including the
Sac,
Fox,
Winnebagoes,
Pottawattamies,
Otoes,
Omahas,
Sioux,
Ioways and
Dakotas. Most of the area in the territory was originally part of the
Louisiana Purchase and was a part of the
Missouri Territory. When
Missouri became a state in 1821, this area (along with
the Dakotas) effectively became
unorganized territory. The area was closed to white settlers until the 1830s, after the
Black Hawk War ended. It was attached to the
Michigan Territory on June 28, 1834. At an extra session of the Sixth Legislative Assembly of Michigan held in September, 1834, the Iowa District was divided into two counties by running a line due west from the lower end of
Rock Island in the
Mississippi River. The territory north of this line (which started just south of the present-day
Davenport) was named Dubuque County, and all south of it was Des Moines County. When
Michigan became a state in 1836 the area became the
Iowa District of western
Wisconsin Territory—the region west of the
Mississippi River. The original boundaries of the territory, as established in 1838, included
Minnesota and parts of
the Dakotas, covering about of land.
Burlington was the provisional capital;
Iowa City was designated as the official territorial capital in 1841.
Fort Snelling was located on the western side of the Mississippi placing it within the Territory until statehood. When Iowa became a state on December 28, 1846, no provision was made for official organization of the remainder of the territory.
Morgan L. Martin, the Wisconsin territorial delegate to congress, pushed through a bill to organize a territory of Minnesota which would encompass this land. While the bill passed in the House, it did not pass the Senate. In the following session a bill by
Stephen A. Douglas was introduced in the Senate but also did not pass. The situation was resolved when
Minnesota Territory was organized on March 3, 1849, the day before the close of congress. In the
1840 United States census,
18 counties in the Iowa Territory reported the following population counts: ==Governance==