I do not think British losses were America's fault. I didn't say that, you did. I just meant they were an ally, and that they and the commonwealth countries did what they could.
The Nazi's had to be defeated, with or without British help. The Brits knew that in 1939 and they fought alone as the Wests only bulwark against Hitler until 1942.
Regards.
It was in Britain's interest to fight the Nazis. We came to their aid, not the other way around.