Jonas Salk<span> </span><span>was an American </span>medical researcher<span> and </span>virologist<span>. He discovered and developed one of the first successful </span>polio vaccines in the 1950's.
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Answer:
Native Americans suffered 80-90% population losses in most of America with influenza, typhoid, measles and smallpox taking the greatest toll in devastating epidemics that were compounded by the significant loss of leadership.
Explanation:
The answer of the question is b
That they were done on slavery and that they believed in equal rights for all
