What challenges did American cities face in the late 1950s and early 1960s unravel?

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The 1950s in America are often described as a time of complacency. By contrast, the 1960s and 1970s were a time of significant change. New nations emerged around the world, and insurgent movements sought to overthrow existing governments. Established countries grew to become economic powerhouses that rivaled the United States, and economic relationships came to predominate in a world that increasingly recognized that the military may not be the only means of growth and expansion.

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