Answer:
The main damange that the arrival of Columbus caused to the Native American civilizations was the spread of Eurasian diseases like measles or viruela, for which the Native Americans did not have antibodies.
These diseases were very contagious, and quickly spread among the Native populations all over the Americas, from Canada to South America, killing about 90% of the pre-columbian population.
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Answer: Japan
Explanation: On December 7, 1941, Japan staged a surprise attack on Pearl Harbor, decimating the US Pacific Fleet. When Germany and Italy declared war on the United States days later, America found itself in a global war.
Answer:
Women and minorities filled the jobs that opened up to them for the first time.
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