Pulling all non naval and non-ambassadorial forces back to the western hemisphere is a good idea. The US does not need to be in the business of liberating the world. If they are not liberated by now, its their own damned fault. Devil take the hindmost, as they say. For over two hundred years the USA has been an almost continuously "ON" war machine and its time to end it. Eisenhower and Washington, both Generals and Presidents warned respectively of the dangers of the military-industrial complex, and of binding alliances.
For those who think America is some sleeping giant, rudely awakened by an attack, the giant never went to sleep, except for once in awhile when he was to poor to fight. Here is a little list of American armed conflicts abroad, and dometic armed conflicts since America's beginning.
The American Revolutionary War1775-1785
Native American Conquests 1775-1890 (too many to list individually)
Shay's Rebellion 1786-1787
Whiskey Rebellion 1794
The Quasi War with France 1798-1800
Fries' Rebellion of Pennsylvania 1799
The Barbary Coast Wars 1800-1815
War of 1812 1812-1815
Mexican War 1846-1848
Bleeding Kansas 1855-1860
Battle of Harper's Ferry 1859
American Civil War 1861-1865
Hawaiian Intervention 1893
Spanish-American War 1898
Samoan Intervention 1898-1902
Phillipino Independance Wars 1899-1913
Boxer Rebellion 1900
Panamanian Intervention 1900
Latin American Interventions 1890-1933 (too many to list)
Vera Cruz Landing 1914
Mexican Invasion 1916-1917
World War I 1917-1918
Anti-Bolshevik Operations 1919-1921
World War II 1941-1945
The Cold War 1945-1990
Korean War 1950-1953
Invasion of Guatemala 1954
Vietnam War 1956-1975
1st Lebanon Intervention 1958
Dominican Occupation 1965
Bombing and later Evacuation of Cambodia 1969-1975
Bombing of Laos 1971-1973
Alcatraz "AIM" Occupation Removal 1971
Wounded Knee II "AIM" Occupation 1975
Operation Eagle Claw, Iran 1980 1980
Libya 1981,1986
Lebanon 1982-1984
Grenadan Invasion 1983
Operation Earnest Will: IRAN 1987-1988
Panamanian Invasion 1989
Persian Gulf War 1991
Undeclared Iraqi War 1991-1998
Somalia 1992-1994
Branch Davidian Rebellion 1993
Bosnia 1994-1995
Haiti 1994
Sudan 1998
Afghanistan 1998
Operation Desert Fox: Iraq 1998
Undeclared Iraqi War 1998-2003
Kosovo War 1999
AlQaeda attack on USS Cole 2000
Enduring Freedom- 2001-Present
Afghanistan 2001-Present
Phillipine Islamists 2001-Present
Operation Iraqi Freedom 2003-?
We went to war with Iraq for no better reason then the regime in charge wanted to. Whatever its own reasons are, are moot. It was going to happen. And it will happen again.