Why do so many people discount British contribution to WW2?

Its undeniable that many people, particularly Americans, believe they won the war alone. However, we need to remember that the war was won by an ALLIANCE of countries, hence the ALLIES. However, before the americans entered the war, Britian fought "The Battle of Britian", and while many say we were on the defensive, we were standing up to a man who sought annexation all over Europe, ALONE. While we did stay immobile for a few months afterwards, it was because we had to recover from our temporary defeat in Europe, due to the surrendering French. However, we fought alone, and decimated the German army in France before leaving, and, for the first time, defeated Germany alone. However, some people view Britian as a "small friend " to the USA, which is an insult to all brave men that fought and died for Britian. IF ANYONE WON THE WAR ALONE, It was Russia, and, while Communist and unstable, it saved us all, in the end, from a fascist regime, which, otherwise wouldve triumphed.