United States of America
The USSR lost the most troops and killed the most German troops. They destoyed most of the german tanks and even took the capital city of Berlin. The USSR also attacked Japan which put one of the final nails in the coffin of Japanese expansionism.
Why are there so many of these polls nowadays but NOBODY WANTS TO DEBATE? *sigh*
Nazis got rekt by Zhukov, Freaking n00bz.
It's a given
this is just a fact, no patriotic bias
First of all, America joined in WW2 in 1941 but WW2 started in 1939 (2 years later). So the soviets was by themselves with the British for 2 years. America join in next. Yes, america helped but Russia had the most casualties up to almost 6,000,000 soldiers. Now I'm not saying america didn't do anything in WW2, Im saying that russia started earlier and they killed most of the German troops.
Russia killed more Germans than all the other Allied nations combined times 5, killed the most German tanks, held the eastern front almost by itself, took Berlin, etc. The U.S. didn't even enter the war until much later than Russia. The U.S. clearly played a crucial role in the War, but the guys in the other column verbally licking their 'Murica-induced boners are engaging in a thoroughly unwarranted gesticulation.
Russia does take the cake for having lost the most lives. Thats about the only thing they dominated at.
The U.S. opened the sea routes into northern Russia and supplied the Soviet military with food, water, and weapons to fight back against German armies. Not only did the U.S. supply the Red Army, but it was U.S. bombers that leveled most of Germany's infrastructure (power plants, factories, refineries, etc.). American soldiers lead the entire advance through Europe, Africa, and the German Fatherland itself. The Soviets only were able to storm and take the Reichstag with support from American artillery and armored cavalry (tanks and other armored vehicles). And for anyone who doesn't know history too well, the Soviet Union was allied with Germany in 1939. Stalin himself ended the alliance and Hitler nearly took the Soviet Union in less than six weeks. Hitler's plan only failed due to American intervention.
Casualties is not the best way to determine contribution size. Having the most dead could be taken as having faulty military strategies or just simple incompetence. The US fought ALL the axis powers, made significant and major accomplishments to their defeat, and did it with less casualties than the Russians.