Complete nonsense. The US became the largest economy in 1870 (70 years before the start of the war). And in 1875 it became the 1st country to start using crude oil. Even in 1940, the US exported 75% of the worlds oil. Most of the main directions of advance by Germany and Japan were trying to get access to the 15% of the worlds oil they could get to (Romania, Baku and Indonesia). The US economy was 3x the size of Germany's (#2 by GDP) and was the majority of the world's industrial and manufacturing.

Let's try this another way, during WWII the US built warship tonnage equivalent to all the rest of the world's navies combined...in just 1943. Then the US did that again in 1944. At one point, the US hit a Japanese fleet with 17 fleet carriers at once. Keep in mind the Japanese only built 9 fleet carriers total and that was considered the most powerful fleet in the world at the beginning of the war.