And between 1956 and 1992 America constructed the interstate system, among the largest public-works projects in history, which criss-crossed the continent with nearly 50, 000 miles of motorways.

1956至1992年间，美国建设了州际公路体系，与近50,000英里的高速公路交错成网，覆盖整个大洲，这也是有史以来最大的公共工程之一。