Wasn't the first interstate built in Kansas?
Kind of. President Eisenhower signed the Federal Aid Highway Act in 1956, which is generally considered the start of the nationwide interstate project. Shortly afterward, Pennsylvania incorporated its already-built tollway into the interstate system, and Missouri let the first interstate contract. But the first completed interstate project was an eight-mile section of Interstate 70 west of Topeka, which opened Nov. 14, 1956.