That total is almost $2 trillion more than all federal government spending during the recently completed 2017-18 fiscal year.
The report, from Watson Institute of International and Public Affairs at Brown University, also finds that more than 480,000 people have died as a direct result of fighting. Over 244,000 civilians have been killed. Another 10 million people have been displaced due to violence.
The $5.9 trillion figure reflects the cost across the U.S. federal government since the price of war is not borne by the Defense Department alone, according to Neta Crawford, the study’s author.