Vietnam War.

The Vietnam War, the nation's longest, cost fifty-eight thousand American lives. Only the Civil War and the two world wars were deadlier for Americans. During the decade of direct U.S. military participation in Vietnam beginning in 1964, the U.S Treasury spent over $140 billion on the war, enough money to fund urban renewal projects in every major American city. Despite these enormous costs and their accompanying public and private trauma for the American people, the …

…As this tragic example reveals, the war rent the fabric of trust that traditionally clothed the American policy. Vietnam figured prominently in inflation, unfulfilled Great Society programs, and the generation gap. The Vietnam War brought an end to the domestic consensus that had sustained U.S. cold war policies since World War II and that had formed the basis for the federal government's authority since the sweeping expansion of that authority under Franklin D. Roosevelt.