A lack of water, pollution.
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The Postwar Economy: 1945-1960. As the Cold War unfolded in the decade and a half after World War II, the United States experienced phenomenal economic growth. The war brought the return of prosperity, and in the postwar period the United States consolidated its position as the world's richest country.
Every nation has a chief of state, a person who serves as the symbolic leader of the country and represents the nation. In the United States, the president both leads the government and acts as the chief of state, although this is not the case in many countries. As chief of state, the president presides over commemorations of war heroes, throws out the first pitch at baseball games, and attends funerals of world leaders, among other duties.
