File:1820 Territorial Growth.jpg

United States Geological Survey's map showing the territorial growth of the United States.

Description: The United States in 1819. The Missouri Compromise prohibited slavery in the Unorganized territory of the Great Plains (dark green) and permitted it in Missouri (yellow) and the Arkansas Territory (lower blue area).

Artist: Compiled by H. George Stoll

Date: 1970

Source:Obtained from Wikimedia commons: http://en.wikipedia.org/wiki/File:USA_Territorial_Growth_1820.jpg Permission: This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy.