We have to take over for the men while they are gone at war.
One of the causes of the war was the treatment of Germany after WWI. They were neglected and treated poorly. This angered them to a point where they wanted to fight. It changed the face of the world because they realize that every country needs to be included in discussions and treaties.
World War II ended with Japan and Germany surrendering to the Allies. However an effect of the war was the Cold War that developed over the next 5 years. Later on, the countries team up to take down the fascist regime.
An impact of the war was definitely helpful. The impact on the American economy and the workforce. More jobs were given to women while the men were out at war. Also, there were more opportunities for men who could join the war. The US was still recovering from the great depression. However, the war soon changed their unemployment rate from 25%.