Once known as Pequot Path, King's Highway, and the Boston Post Road, U.S. Route 1 has paved the way for interstate commerce in the United States. What is now U.S. Route 1 was once colonial America's first highway.
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Route 66 became a popular route because of the active promotion of the U.S 66 Highway Association, which advertised it as “the shortest, best and most scenic route from Chicago through St. Louis to Los Angeles.”