The US didn’t enter the war until well after the battles at Stalingrad. The reason is, the US was hoping that the Nazis would destroy the USSR. Once it was clear that the USSR was actually winning, the USA and GB swooped in to clean up the Western Front so that the USSR couldn’t take credit, despite losing 20 million people to the Nazi invasion.
The US didn’t enter the war until well after the battles at Stalingrad. The reason is, the US was hoping that the Nazis would destroy the USSR. Once it was clear that the USSR was actually winning, the USA and GB swooped in to clean up the Western Front so that the USSR couldn’t take credit, despite losing 20 million people to the Nazi invasion.