Which statement is false regarding the effects of world war ii on the united states?

Since there are no statements which we could infer as true or false, maybe you could gain some insights on this.  

World War II was the effect of the remnants of conflicts after World War I (1914-1918) and Adolf Hitler’s attack on Poland on September 1939 Great Britain and France to declare war. World War II continued for 6 years being named as the ‘deadliest war in the history’, involved thirty countries and an estimation of eighty-five million deaths. The following are the involved countries during the war:  
 
Axis Powers: Germany, Italy, Japan   Co-signers of the Tripartite Treaty: Bulgaria, Hungary, Romania, Slovakia   Countries in conflict with Axis Powers( before the World War II): Austria, Ethiopia, Republic of China   Allied Powers: Australia, Brazil, Canada, Newfoundland, New Zealand, South Africa, Soviet Union, United Kingdom, United States  
 
Supporters of the Allies: Dominican Republic, Ecuador, Bolivia, Chile, Guatemala, Colombia , Cuba, Costa Rica, Egypt, El Salvador, Haiti, Honduras, Iraq, Lebanon, Liberia, Mexico, Mongolia, Nicaragua, Panama, Paraguay, Argentina, Peru, Saudi Arabia, Turkey, Uruguay, Venezuela  
 
Countries that were attacked: Norway, Philippines, Algeria, Thailand, Tunisia, Yugoslavia Albania, Belgium, Latvia, Lithuania, Burma, Czechoslovakia, Denmark, Estonia, Finland, France, Luxembourg, Morocco, Netherlands, Greece, Iceland, India, Iran, Poland, Singapore, Syria,  

What one could say is false about the effects of World War II on the United States would be saying that the WW2 hurt American economy when in reality, following the war there was a huge post-war boom in terms of spending and growth.