Probably when it invaded the USSR. I'm not gonna do the meme and say it's impossible to invade Russia, but trying to invade Russia while pursuing a grinding war with a US-armed Britain (and the increasing likelihood that the US was going to intervene eventually, was always going to be a recipe for disaster. Hitler's best bet was always going to be to wait out the UK until they broke and negotiated a separate peace. Then if he really wanted to stick it to Stalin he should probably have waited at least a few years to consolidate his hold over continental Europe and rebuild his strength. Of course even then it would have been a tall order, but at least he wouldn't have forced himself into the situation that even the Kaiserreich was desperately trying to avoid in 1914.
Thank goodness for evil's self-defeating nature.
I mean invading the USSR though was the entire goal of the war to begin with , not defeating the UK . So I don’t get the what ifs behind what if the Nazis didn’t invade the USSR because in that case they would not be Nazis to begin with .
good thing I said this then
The USSR will grow exponentially more powerful than Germany with every year Germany delays it's invasion. The big military reforms will be complete in 1942. Part of the reason for invading in 1941 was if they wait too long they miss their window.
Also by 1941 Germany isn't fighting a "grinding" war with the UK. The issue in the West is settled (UK can't hope to invade Europe proper in any reasonable time frame) and there is only a secondary theater in the Mediterranean.
Bringing the USA into the war was probably the single biggest unforced error made by the Germans overall.