In the 1900s and 1910s, EuroLanders viewed the US as a step or two above Neanderthalic. Then in 1917 and 1918 the US provided the critical mass - men, materiel, and men - needed to end WW1 in German defeat.
In the 1920s and 1920s, EuroLanders viewed the US as two or three steps above Neanderthalic. Then in 1940-1945 the US provided the critical mass - men, materiel, weapons, and transport (sea and land) - needed by the UK and USSR to end WW2 in German defeat. And in the Pacific, engineered the oceanic* defeat of Japan all but alone.
[/b]* I'm not ignoring the efforts of China or of the British Empire in India and Burma or of the Aussies in New Guinea.