The Allies won WW2, Russia arguably sacrificed the most - the US benefited from the Allies victory and the decline of the British empire to assert near-global economic and military hegemony.
Correct. 93% of German casualties were inflicted by the Red Army[1]. Operation Overlord was part of a 'blood debt' that Stalin felt western allied leaders owed him. The Russians would've likely taken Berlin eventually without the western allies opening up the western front, despite what Band of Brothers etc. might tell you.
This Hollywood effect is spread throughout the world (since Hollywood pretty much is spread throughout the world today). Here in South America if there was a movie about WWII on tv, it was with the US beating the germans. Never saw one with russians. Brazil never even made a movie about the brazilians who went over to fight in Europe. Hollywood is, culturally, very very powerful.