One economic impact of the united states' entry into world war ii was that the united states —

America's involvement in World War II had a significant impact on the economy and workforce of the United States. The United States was still recovering from the impact of the Great Depression and the unemployment rate was hovering around 25%. Our involvement in the war soon changed that rate. American factories were retooled to produce goods to support the war effort and almost overnight the unemployment rate dropped to around 10%. As more men were sent away to fight, women were hired to take over their positions on the assembly lines. Before World War II, women had generally been discouraged from working outside the home. Now, they were being encouraged to take over jobs that had been traditionally considered 'men's work.'

c. businesses/firms & government

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.