Platte Purchase

The Platte Purchase was a land acquisition in 1836 by the United States government from American Indian tribes of the region. It comprised lands along the east bank of the Missouri River and added 3,149 square miles (8,156 km2) to the northwest corner of the state of Missouri.

This expansion of the slave state of Missouri was in violation of the Missouri Compromise of 1820, which prohibited the extension of slavery in the former Louisiana Territory north of the parallel 36°30′ north, except within the boundaries of the state of Missouri, as defined at the time of the adoption of the Missouri Compromise. The area acquired was almost as large as the states of Delaware and Rhode Island combined, and extended Missouri westward along the river. St. Joseph, one of the main river ports of departure for the westward migration of American pioneers, was located in the new acquisition.

This territorial expansion significantly altered the state's borders and extended slavery north of the Missouri Compromise line. The newly acquired counties would later play important roles in both westward expansion and the regional politics of pre–Civil War Missouri.

The region of the Platte Purchase includes the following modern counties within its bounds: Andrew, Atchison, Buchanan, Holt, Nodaway, Platte, and a small portion of Worth. It also includes what are now the northwest suburbs of Kansas City, a small area of Kansas City proper, the cities of St. Joseph and Maryville, Missouri, as well as Kansas City International Airport and almost all of Missouri's portion of Interstate 29, save the small portion which runs concurrently with Interstate 35 in Clay County.

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