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What is .gov's interest in owning so much of the west,
The federal land in 11 states dwarfs that of the other 39 combined.
The Federal Lands of the United States map layer shows those lands owned or administered by the Federal Government, including the Bureau of Land Management, the Bureau of Reclamation, the U.S. Department of Agriculture Forest Service, theDepartment of Defense, the U.S. Fish and Wildlife Service, the National Park Service, the Tennessee Valley Authority, and other agencies. Only areas of 640 acres or more are included. Descriptive information includes the name and type of the Federal land and the administering agency. There may be private inholdings within the boundaries of the Federal lands in this map layer.
More at http://nationalatlas.gov/mld/fedlanp.html