Answer:
Disease and starvation
Explanation:
Most contemporary historians estimate that between 9.4 and 12 million Africans arrived in the New World. Disease and starvation due to the length of the passage were the main contributors to the death toll with amoebic dysentery and scurvy causing the majority of deaths.
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It first started with the Pearl Harbor Attack and was officially announced by Roosevelt in the Quarantine Speech.
It show that civilians had a understanding of astronomy
