The United States emerged as the wealthiest country after World War II.
The war devastated much of Europe and Asia, leaving the US relatively unscathed.
The US had a strong industrial base and a growing economy, making it a major supplier of goods and services to the war-torn world.
The Marshall Plan, a massive economic aid program, helped rebuild Europe and boost US exports.
The US also benefited from the Bretton Woods Agreement, which established a new international monetary system that favored the dollar.
These factors combined to make the US the wealthiest country in the world by a significant margin after WWII.