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:
Answer: The contribution made by the Soviets was vital. They provided diplomatic support, strategic and grand tactical planning, including the planning of the invasion of South Korea, and essential logistical support. They supplied and trained the air forces of China and North Korea
Answer:In 589, following the Period of Disunion, China reunified under the <u>SUI</u> dynasty. The next dynasty to rule China, the <u>TANG</u> , would rule for almost 300 years. One of its greatest leaders was the emperor <u>TAIZONG</u> , who introduced laws to strengthen the Chinese government and military.
Explanation: Plato users it is correct
The territory that became an independent country and was not a U.S. acquisition during American imperialism in the 1890s is Cuba.
In the 1890s, the Island region known as Cuba was under Spanish rule until the Spanish-American war.
Following the Spanish-American war in 1898, when the United States defeated Spain, the Spanish government ceded the Cuba territory to the United States under the Treaty of Paris.
However, by 1902, Cuba became independent, which made the island to be removed from the United States acquisition during the period of American imperialism in the 1890s.
Hence, in this case, it is concluded that the correct answer is Cuba.
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