The National Interstate and Defense Highways Act fashioned the growth of suburban communities in postwar America by popularizing car travel. In what year was this expansionary act signed into law by President Dwight D. Eisenhower?

Answer 1956

With the creation of highways came other well-known businesses, including the Holiday Inn and other hotels which are often found on highway exits. McDonald's and other fast food chains started to appear at the same time. The highway system also expanded the St. Lawrence Seaway from the Atlantic to the Great Lakes, making the St. Lawrence River a major waterway for trade vessels in the mid-20th century.

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