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From Wikipedia: "Bikecentennial '76 was an event consisting of a series of bicycle tours on the TransAmerica Bicycle Trail across the United States in the summer of 1976 in commemoration of the bicentennial of America's Declaration of Independence. The route crossed ten states, 22 national forests, two national parks, and 112 counties between Astoria, Oregon, and Yorktown, Virginia, a distance of about 4,250 miles (6,840 km). The route was chosen to take cyclists through small towns on mostly rural, low-traffic roads.
Article about Bikecentennial on AdventureCycling