The 17th state to join the United States was Ohio. Ohio was admitted to the Union on March 1, 1803 and is located in the Midwestern region of the country. It is bordered by Michigan, Pennsylvania, West Virginia, Kentucky, and Indiana. Ohio is known for its diverse geography, ranging from the Appalachian Mountains in the east to the Great Lakes in the north. It is also home to many major cities, including Cleveland, Cincinnati, and Columbus.