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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.
To sum it down Congress' challenge was whether to allow slavery in new territories, it was so because the southern states had helped drastically in the Mexican-American war and from which they believed they would receive a reward for, Congress ended up splitting have of the new territories into slave states and non slave states.
1947 is when the British raj rule ended
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