In 1803, Ohio became the 17th state admitted to the Union. The state had previously been part of the Northwest Territory, which consisted of the present-day states of Illinois, Indiana, Michigan, Wisconsin and part of Minnesota.
In 1788, the Ohio Company sponsored an expedition of 48 people, who were the first settlers of the state of Ohio. They declared present-day Marietta as the first settlement on the Ohio River. By 1799, the population of the territory had become large enough that the residents were able to elect a house of representatives, and only four years after that, Ohio became a state. The original capitol was located in present-day Chillicothe, but it was later moved to Columbus due to its more central location.