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  American troops help defend South Korea
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  U.S. Sponsored invasion of Cuba fails
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  U.S. build up of troops in Vietnam War
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  U.S. forces Soviet Union to remove nuclear missiles from Cuba.
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  Opec places an embargo on oil to U.S. because of the nation's support for Israel in October war
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  President Nixon visits China and Soviet Union. Nixon and Brezhnev sign first Strategic Arms Limitation Treaty.
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  Paris Peace Accords signed, ending U.S. involvement in Vietnam War
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  U.S. signs treaty agreeing to return Canal Zone and control of the canal to Panama by 1999
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  President Jimmy Carter sponsors peace talks between Egypt and Israel
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  American public learns that U.S. secretly sold weapons to Iran in hopes of gaining release of American hostages in Lebanon
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  U.S. establishes full diplomatic relations with China
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  In response to Soviet invasion of Afghanistan, U.S. places an embargo on sales of American grain to Soviet Union, boycotts Moscow Olympic Games, and delays completion of SALT II.
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  President Ronald Reagan orders invasion of Grenada after a Marxist revolution in that Carribean nation.
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  U.S. invades Panama and captures Manuel Noriega
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  Bush and Gorbachev hold summit in Washington, D.C.
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  U.S.-led multinational force ends Iraqi occupation of Kuwait
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  Attack on the U.S.- The war on terror