The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, Pub. L. 84–627 was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion (equivalent to $220 billion in 2025) for the construction of 41,000 miles (66,000 km) of the...
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