The answer is C. ethnic tensions
ASDIC was the primary underwater detection device used by Allied escorts throughout the war.
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Answer- Political machines are most likely to contribute in a positive way.
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The Bonus Army was the popular name for an assemblage of some 43,000 marchers 17,000 US World War I veterans, and their families, and affiliated groups who gather in Washington DC in the summer of 1932 to demand a cash payment redemption of their service certificates.