When Was The Interstate Highway System Built. Eisenhower system of interstate and defense highways was designated as one of the seven wonders of the united states in 1994 by the american society of civil engineers (asce). A bibliographic survey (monticello, il, 1982);

Eisenhower national system of interstate and defense highways, or more commonly known as the interstate, resulted. Defense was the primary reason for the interstate system. Beltways are designed to carry interstate traffic around cities.