Which part of World War Two do you believe was most important for turning the momentum for the allied powers?

The turning point of WWII is detestably Stalingrad.

Explanation:

The Nazis invaded Russia on June 22, 1941. This was all in part of Operation Barbarossa. Nazis took over much of western Russia expending a great number of man power and resources in the process. Germany reached Stalingrad and began their assaults on the city on August 23, 1942. The Soviets stood their ground despite having far less training, equipment, firepower, food, and other resources. The Soviet troops outnumbered the Nazis and were able to successfully defend Stalingrad. The Nazis expended so many resources during Operation Barbarossa that their hold on the Eastern front was nearly crippled. Seeing this, Stalin began ordering an offensive campaign on the Nazis. Nazi occupied territories began siding with the Soviets which allowed the Soviets to grow in strength. With the defeat and dramatic loss of resources due to Stalingrad and the Soviet offensive campaign along with the increased allied manpower and bombing runs across the Western Front, Germany was surrounded.

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity