On June 6th, 1944, allied forces under the flags of Canada, the United Kingdom, and the United States landed on Juno, Sword, Gold, Utah, and Omaha beaches in Normandy in the largest landing invasion in history, paving the way for a western front to be opened in Europe during WW2.
Plus it's my birthday today, so I figured I'd ask!
Look i dont know the month to month military capabilities of the western front. But what i do know is that the west was incentivized to delay invasion for as long as possible. Yes, part of that was military build-up, but part of that was also just letting the USSR and Nazi Germany tire each other out. And after the war, instead of recognizing the wins, losses and efforts the soviets made during the war, the US almost immediately jumped into cold war posturing.