The US provided weapons and manpower, the Soviets provided weapons and manpower, and the British provided weapons and manpower.

The US produced about 30,000 light tanks and 70,000 medium tanks, including self-propelled guns based on such tanks. Britain produced about 50,000 in total. The Soviets produced about a similar number to the US (and over 10,000 heavy tanks). Britain, the US, and Soviet Union produced about 230,000, 260,000, and 520,000 artillery pieces. For munitions, the US produced about 1/2 of Allied munitions, and Britain and the Soviet Union about 1/4 each.

While US shipbuilding dwarfed British shipbuilding (and even more so the Soviet), the British started with a large navy, and built 4 battleships, 23 aircraft carriers, 30 cruisers, 257 destroyers, 176 submarines, and 429 ASW escorts during the war.

Britain, with a population of about 1/3 that of the US, had a peak armed force strength about 1/3 of the US (and a similar ratio compared with the Soviet Union, accounting for the population of German-occupied territory).

Britain, with a smaller population and industry compared to the US, contributed proportionally as far as they could. Ditto the Soviet Union. The war was not a war of American weapons and Soviet manpower alone.