“why do people forget that Germany had allies?”
Italy, Spain, Romania are pretty forgettable as allies....
Don’t forget the one that has really gone down the memory hole: Finland.
Everybody talks about the gallant Finns of the Winter War, and nobody ever mentions them fighting alongside the Nazis later in the war.
BTW, the Finns were the only allies whose divisions were regarded by the Germans as equivalent to a German unit.
Don’t forget the mighty Hungarians who fought on the Eastern Front. They provided Hitler with nine infantry divisions, comprising 200,000 soldiers.