2.  Issued by President
Monroe – U.S. warned
Western Europe to
stay out of the
Western Hemisphere
 Up until the 1900 the
U.S. did not get
involved in foreign
affairs outside the
Western Hemisphere

3.  U.S. becomes a
world player
 Multi-polar world

4.  U.S. enters late in
the war (1917)
 After the war, the
U.S. returns to
isolationism

5.  U.S. attacked (Pearl
Harbor, Dec. 1941)
 After the war -
bipolar world

6.  US v. USSR
 NATO versus Warsaw
Pact
 Massive nuclear arms
buildup
 1946-1991
 Truman Doctrine
◦ Policy of aiding countries
fighting communism
 Korean War
 Vietnam War
 Carter Doctrine
◦ Affirms U.S dependence
on foreign oil

7.  War Power’s
Resolution (1973)-
◦ Gives president greater
authority to take
military action
◦ Never been tested
 Fear of US hegemony
(spread of US power)
◦ China
◦ India
◦ Russia

8.  Collapse of the
Soviet Union leaves
the U.S. as
dominant power
 Unipolar world
 Iraq invades Kuwait
 Persian Gulf War-
1991
 US forces Iraq out
of Kuwait

9.  9/11/01 changed
everything
 Bush Doctrine
 US. Policy to go
aggressively after
state sponsored
terrorism
◦ unilateralism
◦ preemptive strike
 Dept. of Homeland
Security

10.  2003-US Invasion
of Afghanistan &
Iraq
 Afghanistan had
harbored Al-Qaeda
 US felt Iraqi WMD
threatened US