How much money did World War 1 cost the US?

World War I cost the United States approximately $32 billion, equivalent to around $500 billion today when adjusted for inflation. This figure includes military expenditures, equipment, and support for the Allies. Additionally, the war significantly impacted the U.S. economy, leading to increased national debt and changes in economic policies. The financial burden contributed to the economic conditions leading up to the Great Depression in the following decade.