The Declaration of Independence happened in July 4, 1776
Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
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D. It stated that people have the right to overthrow their government when their basic rights are being violated.
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