Who’s efforts in the 1940s and 1950s nearly eliminated polio?

The correct answer is "Jonas Salk".

Jonas Salk was an American virologist who developed one of the world's successful vaccines against Polio. He studied in the medical school of the University of New York. After deciding he would devote his further efforts to medical research, he goes on to work for Mount Sinai Hospital in 1939. He would develop the vaccine for polio during his time at this medical center.

- "the four new england colonies of colonial america included colonies of new hampshire, massachusetts bay colony, rhode island and connecticut."

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the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation