Here's terrific background of the institution responsible for getting the information that facilitated westward expansion and the actual physical creation of the nation.
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Originally proposed by Thomas Jefferson to create a nation of "yeoman farmers", the PLSS began shortly after the American Revolutionary War, when the federal government became responsible for large areas of land west of the original thirteen states. The government wished both to distribute land to Revolutionary War soldiers in reward for their services, as well as to sell land as a way of raising money for the nation. Before this could happen, the land needed to be surveyed.
The Land Ordinance of 1785 marks the beginning of the Public Land Survey System. The Confederation Congress was deeply in debt following the Declaration of Independence. With little power to tax, the federal government decided to use the sale of the Western Territories to pay off American Revolutionary War debt. The Public Land Survey System has been expanded and slightly modified by Letters of Instruction and Manuals of Instruction, issued by the General Land Office and the Bureau of Land Management and continues in use in most of the states west of Pennsylvania, south to Florida, Alabama, and Mississippi, west to the Pacific Ocean, and north into the Arctic in Alaska.
