If you learn history by watching American movies then I can see people believing we won it.

But in school I was taught the old adage: American steel, British intelligence, and Russian blood won the war.

EU is not a monolith. It really depends on where you grew up. Here in the Netherlands we learn mostly about the Canadians, British and Polish forces and Americans troops. Since those were the units that liberated the country.

Then sadly instituted dictatorships in a lot of countries...

Some fun facts: during WWII, one of the biggest contributions the US made to the USSR war effort was food (as well as trucks to transport it). More specifically meat, since one of the side effects of Stalin's assault on the "kulaks" (or wealthy peasants) in the 1930s was the annihilation of something like 80-90% of the Soviet Union's livestock (the main effect, of course, was the annihilation of 5-7 million human beings). And even more specifically SPAM, which Russians often referred to as "second front" - a dig on the fact that they were getting canned meat instead of an invasion of Europe by the Western Allies.

Where are you from in the EU? Cause that's not how it's taught at all, from my background. The USSR helped start the war and without the lend lease program, from the uk/us, would have probably been taken over by the nazis.

We do? Guess my history lessons didn't cover this. I thought we were all equal, apart from the US only joining during the last half

Similarly, I feel like Canada's contribution is overblown, but that's probably because I'm in Canada.