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:
Archibald "Archie" Cox Jr.<span> (May 17, 1912 – May 29, 2004)</span>
C) The defeat of Spain at the battle of bloody marsh!
Answer:
TSHA | African Americans - Texas State Historical Associationhttps://www.tshaonline.org › handbook › entries › afric...
Explanation:
Following the German invasion of Poland on September 1, 1939 hundreds of thousands of Jews and other Polish citizens fled eastward ahead of the advancing German army; many refugees found at least temporary safety in Lithuania. Options for escape were limited and required diplomatic visas to cross international borders. One route was through Asia using a combination of permits issued by foreign envoys responding to the refugee crisis: a bogus visa for entrance to the Dutch Caribbean island of Curaçao and a visa for transit through Japan.
