Answer :

At the end of world war II, United States had the world's most productive economy.

The World War II saw the most rapid economic growth in American history, together with a centrally planned economy. The War Production Board's elected representatives distributed strategic resources among end users in accordance with the production levels determined in Washington. Key costs and salaries were managed rather being left to markets. The federal government oversaw, provided funding for, and most often owned the vast majority of investments.

The World War II was undoubtedly an economic success story. Most of this expansion occurred after 1940, when the nation was already essentially at full employment, rather than during the Depression's recovery.

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