Unfair.
In 1940 there weren’t too many Americans fighting. Proportionately the British played a much bigger fighting role and for longer.
By 1945 Britain was bankrupt and had lost an empire, all thrown away to fight the Nazis. The US emerged as the greatest power on earth and richer than God.
To imply that Britain shirked in the Second World War while the US did all the work is quite simply nonsense and it is unworthy of an American to say so.
By the way the people who said that about the British were people like Joe Kennedy and other Nazi-sympathizing isolationsists.
It wasn't Nazi sympathizers, every US veteran I've met who served in WWII who served in Europe said it. It's a concise if harsh summation of what went on. It can't compare with the blanket statement above -- that the entire US armed forces was made up of racists, so up yours.
I hardly blame the UK for fighting as little as possible and letting the Germans punch themselves out in the USSR, while constantly insisting on sideshows that were low priority for Hitler but just by coincidence of strategic importance to the UK after the war. World War 1 had been monstrously costly in terms of human life on the allied side in the west, about 2.5 times worse than that endured by the Central Powers. Had Germany suffered equal losses, there wouldn't have been a second WW. The rapid collapse of France in 1940 is often attributed to that previous lost generation.
In 1940 the British were losing the Pacific to the Japanese, enduring the terror bombing by the Luftwaffe, and the US didn't get pulled into the war (despite FDR's best efforts) until late in 1941. Earlier in 1941 the industrial output of the US was rising, and the US was laying keel and pushing every kind of needed item that could be moved by sea to the UK, almost 3000 purpose-built cargo ships.