Missouri Compromise line
This map of the United States, circa 1820, shows the line between free and slave states that was established by the Missouri Compromise of 1820. The line extended along the parallel 36°30′ north, which roughly runs along the northern edge of present-day North Carolina, Tennessee, Arkansas, Oklahoma, New Mexico, Arizona, and westward through Nevada and California.
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"Missouri Compromise Line."
http://en.wikipedia.org/wiki/File:Missouri_Compromise_Line.svg
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