Turning points in U.S. foreign policy and world stature

How and why did the United States’ position on the world stage change ca. 1890-2010? Choose at least three of the following as key turning points in U.S. foreign policy and world stature, with at least one from each column.
Spanish American War
World War I
World War II
Cold War, ca 1945-1962
End of the Cold War (1990s)
War on Terror

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