Congress passed the federal-aid highway act in 1956, which funded more than miles of interstate highways across the country. 40 400 4,000 40,000

The correct answer is 40,000 or more exactly 41,000 miles of highways within the Interstate Highway System that not only had civilian but military purposes since it was supposed to link Air Force bases to all these highways as well. 25 billion dollars were granted for this project which was the biggest in the history of the United States at that time.

The system paid for itself since it was financed by taxes on gasoline and diesel fuel and it took a bit over ten years for it to be completed.

answer; ///the correct answer is,by introducing a merit system of nobility.

im pretty sure it has something to do with the end of ww1