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U.S. Major Highways represents the major highways of the United States. These include interstates, U.S. highways, state highways, and major roads. This dataset is from the Census 2000 TIGER/Line files. It contains all Class 1 and 2 road segments plus any other road segments necessary to provide network connectivity for the Class_Rte field.
U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia.
U.S. States (Generalized) represents the 50 states and the District of Columbia of the United States.