Largest public works project in the US?

The largest public works project in the U.S. is the Interstate Highway System, initiated in 1956. Spanning over 47,000 miles, it was designed to facilitate efficient transportation across the country, enhance national defense, and promote economic growth. Funded primarily by federal gas taxes, the project revolutionized travel and commerce in America, shaping urban development and suburban expansion. Its impact is still felt today, as it remains a crucial component of the nation's infrastructure.