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.
Explanation:
The US<span> and the </span>Soviet Union<span> were only </span>allies<span> in </span>WWII<span> because they were both so worried about Nazi Germany. It was not as if the two countries had any natural reason to be </span>allies<span>. That means that we should not be surprised that they went back to being rivals after </span>WWII<span>. </span>
<span>No, this statement is false. Tsar Alexander emancipated Russian serfs through the Emancipation Edict Reform which was enacted in 1861. This reform gave serfs their freedom from feudal obligations and they were also given land. The landowners did receive compensation from the state. Peasants were then indebted to the sate and were forced to work and make payments as redemption to their local commune.</span>
Answer:President George Washington responded to the Whiskey Rebellion by sending peace officers to broker peace with the rebels and also ordered the Governors to send military troops to enforce the collection of tax. The Whiskey Rebellion was a protest in 1791, against the ‘Whiskey Tax’ imposed on domestic products.
