`` War on terrorism '' is second most-expensive war in U.S. history , report says . Adjusted for inflation , World War II cost more than $ 4 trillion . Comment:
`` War on terrorism '' is second most-expensive war in U.S. history , report says . Adjusted for inflation , World War II cost more than $ 4 trillion . The cost of the wars in Afghanistan and Iraq could total $ 2.4 trillion by 2017 .