Platte Purchase

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The United States in 1820. The graphic shows the straight line western border of Missouri.  The Missouri Compromise prohibited slavery in the Unorganized Territory (dark green) and permitted it in Missouri (yellow).
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The United States in 1820. The graphic shows the straight line western border of Missouri. The Missouri Compromise prohibited slavery in the Unorganized Territory (dark green) and permitted it in Missouri (yellow).

The Platte Purchase in 1836 added 3,149 square miles to the state of Missouri making up its northwest corner.

The Platte Purchase includes Andrew (435 square miles), Atchison (545 square miles), Buchanan (410 square miles), Holt (462 square miles), Nodaway (877 square miles) and Platte (420 square miles) counties.

These areas now include Kansas City International Airport (and the northwest Kansas City suburbs), St. Joseph, Missouri, Mound City, Missouri and Maryville, Missouri. Almost all of Missouri's portion of Interstate 29 is within its bounds. It is an area almost as big as the combined size of Delaware and Rhode Island.

The purchase was presided over by William Clark (of Lewis & Clark fame) at Fort Leavenworth, Kansas.

At the time, the western border of Missouri was the equivalent of the mouth of the Kaw River in Kansas City (94 degrees 36 minutes West longitude)[1] (which is also the border between Missouri and Kansas). The purchase extended the Missouri border in the northwest to 95 degrees 46 minutes West longitude).[2]

The tribes involved were the Ioway tribe (with Chiefs White Cloud and No Heart) and the combined entity of the Sac and Fox tribes.

The tribes were paid $7,500 for their land. The government was to "build five comfortable houses for each tribe, break up 200 acres of land, fence 200 acres of land, furnish a farmer, blacksmith, teacher, interpreter, provide agricultural implements, furnish livestock" and a host of other small items. The tribes agreed to move to reservations west of the Missouri River in what was to become Kansas and Nebraska. At this time there were approximately 1,000 Ioways, 500 Sacs, and 1,200 Foxes.

The tribes had earlier been promised to keep the land permanently. However white settlers (including most spectacularly Joseph Robidoux) quickly broke the agreement.

Martin Van Buren proclaimed the area part of Missouri on 28 March 1837.

It is a historic region of the United States.

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