Before Korean war
The Vietnam were divided in two nations in 1954 to 1975 and the Korean war was 1950 to 1953
The answer is A. Drove production costs up. It drove production costs down, because they were able to take less time to make the products as well as less materials because 1) standardized parts were invented around the same time, and 2) they didn't have people preparing everything so materials weren't wasted.
The answer is number one, proof.
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