Why was the US equipment so poor during WW2?

The American air force was vastly inferior to the Japanese and they only won because of its numerical superiority over the Japanese who had to rely on quality. US navy was at least 10 years behind Soviet Navy and about 20 years behind Japanese navy, although as I said its numerical superiority of Battlehips and... show more The American air force was vastly inferior to the Japanese and they only won because of its numerical superiority over the Japanese who had to rely on quality. US navy was at least 10 years behind Soviet Navy and about 20 years behind Japanese navy, although as I said its numerical superiority of Battlehips and submarines overwhelmed the Japanese.

Why were US military equipment so lagging ?
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