What significant infrastructure project was created by the Interstate Highway Act under Eisenhower?

The Interstate Highway Act, signed into law in 1956 during President Dwight D. Eisenhower's administration, led to the establishment of over 40,000 miles of the interstate highway system. This initiative was a transformative moment in American infrastructure, as it aimed to create a network of highways that would facilitate easier and quicker transportation across the country. The highways were designed for interstate travel and commerce, significantly impacting both the economy and the everyday lives of Americans by promoting suburban growth and enabling greater mobility.

The focus on creating this extensive highway system was partly influenced by the need for national defense, drawing inspiration from the modern highway systems observed in Germany. Additionally, the new infrastructure greatly enhanced safety and efficiency for motorists compared to older roads.

The other options listed do not accurately represent the results of the Interstate Highway Act. For example, the act did not pertain to the creation of national rail systems, urban public transportation, or regional air travel routes, all of which fall outside the scope of this specific infrastructure project.