Causes Foreign relations -- Persian Gulf War, 1991 -- 2 Cold War 1 Drug traffic -- 1 History -- 1 Iraq War, 2003-2011 -- 1 more ... Islam and politics -- 1 Political aspects -- 1 September 11 Terrorist Attacks, 2001 -- 1 Terrorism -- 1 Weapons of mass destruction -- 1 World War, 1939-1945 -- 1 less ...