Cost of U.S. Wars

HISTORICAL COSTS OF U.S. WARS (In 2007 Dollars) from The Center for Arms Control and Non-Proliferation

World War II $3.2 trillion
Iraq and Afghanistan To Date $695.7 billion
Vietnam War $670 billion
World War I $364 billion
Korean War $295 billion
Persian Gulf War $94 billion
Civil War (both Union and Confederate costs) $81 billion
Spanish-American War $7 billion
American Revolution $4 billion
Mexican War $2 billion
War of 1812 $1 billion

Source: Congressional Research Service and Office of Management and Budget data.