Answer:
The introduction of new crops and the decimation of the native population in the New World led to the capture and enslavement of many African people
Explanation:
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Brazil gained it independence on September 7th, 1822. Brazil got their independence because an antagonistic relationship happened between Brazil and Portugal. Brazil proved that their people could over power them.
President Truman had the urge to use the atomic bomb against Japan because the American casualties would continuously rise unless the Empire of Japan surrenders. The thing that would make Japan surrender would be a cataclysmic event, and the bombing of Hiroshima and Nagasaki happened.
It's a close run between all of the above and C. If I would have to choose, I'd say C, since executing ALL the Spanish seems a bit extreme.<span />