While Iraq and Afghanistan have cost over $1 Trillion combined, it's only 1.2% of GDP
WW II cost over 35% !!!
Figures are problematic, as well, because of difficulties in comparing prices from one vastly different era to another. Inflation is one issue—a dollar in the past would buy more than a dollar today. Perhaps a more significant problem is that wars appear vastly more expensive over time as the sophistication and cost of technology advances, both for military and for civilian purposes. The estimates presented in this report," therefore, should be treated, not as truly comparable figures on a continuum, but as snapshots of vastly different periods of U.S. history.