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Following the terrorist plane attack on September 11, 2001, firefighters hoisted the American flag over the Pentagon.

Following the terrorist plane attack on September 11, 2001, firefighters hoisted the American flag over the Pentagon.

AP/Wide World Photos

Following the terrorist plane attack on September 11, 2001, firefighters hoisted the American flag over the Pentagon.

Images of the Era: 1945-Present

Flexibility in meeting change is vital to the success of American democracy. And seldom has change come so quickly as in this era.

After World War II, veterans returned home eager to find jobs and start families. The postwar baby boom, combined with immigration, doubled the U.S. population over the next half century, increasing demands for schools, housing, and goods; and economic growth was unprecedented. In order to expand the benefits of American freedom and prosperity, Congress passed laws aiding the elderly, disabled, and poor, as well as historic civil rights legislation.