The world has experienced all forms of war over the years; however, World War II remains the most expensive conflict in U.S. history when adjusted for inflation, costing roughly $4.7 trillion, according to historical estimates.

Throughout history, wars have shaped nations, redefined borders, and left an immeasurable impact on humanity. While total casualty counts are often used to measure the scale of these conflicts, analyzing wars by their annual death tolls offers a different lens through which to assess their intensity and devastation.