By Allies, I meant the Cold War standings, not the entire Allied contingent. And the Allies were more than those three countries. There were over 70 countries that had forces land on the beaches in Normandy.
Do some research. The consensus among historians is that Germany already lost in 1943, before America/Britain really got involved. When they lost at Kursk, it was all flailing about until the end. All we did was hasten the end by a couple months. Remember, we only faced between 10-20% of the Heer and less than 10% of the Shultzschaffel on the Western Front. Those were mostly refresh and refit units as well, as they were cycled out of the grinder in the East. There were only 100 or so Panthers and less than 50 Tigers on the Western Front, while the East saw over 4000 Panthers, 1300 Tiger Is and 350 Tiger IIs. We faced less than 5% of the Luftwaffe. The vast, vast majority of forces were busy engaging Russia.
America played a significant role in destroying Japan and establishing the lines for the Cold War. For destroying Nazi Germany, not so much.
We supplied the Soviets with thousands of trucks and tons of supplies before we landed on the beaches in North African, Silicy, Italy, and eventually Normandy. The Germans lost the war at the battle of Stalingrad. But really the decision to use army group center in Sept 41 to encircle 650,000 Soviet troops at Kiev and delay the attack on Moscow by a month is what destroyed their entire chance at victory.
