President Warren Harding's secretary of state, Charles Evans Hughes, was the one who called for a ten-year moratorium on warship construction. Britain, France, Japan, Italy, and US were the countries that helped Hughes to create the ten-year moratorium on new warships.
It literally devastated European economy so bad, that they threw out bags of money because it had no worth.
The growth of the city populations.
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Rivers provided all the transportation needs of the plantation and farm owners.