I hope this question refers to the battle of stalingrad
This was a major turning point in WW2 as the Red guard strategically frustrated Hitler delaying his lightening victory tactics, until his soldiers were starved off food, supplies and weakened by encroaching winter. the heavy military loss that Hitler suffered at Stalingrad was never recoverable and from that point forward Hitler was fighting a defensive war from two fronts, a fete that heavily suffocated him.
Once America entered World War II after the bombing of Pearl Harbor, the federal government called on businesses all over the country to increase production of war materials (ammunition, guns, airplanes, etc.). This need for the aforementioned products caused businesses to seek new employees to hire. Considering that millions of men all over the country were drafted into the war, this resulted in women being persuaded to join the work force.
Since women joined the workforce and men were employed by the military, the unemployment rate drops dramatically during World War II. Since more people were employed, more American citizens were getting paid consistently. This helped to ensure that America finally escaped the Great Depression once and for all.