Answer: From the White House, US President John F Kennedy cancelled at the last minute the US air strikes that would have neutralised Castro's aviation. He did so because he felt the United States could not appear to be behind the invasion
Explanation:
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 answer is B. Development of railroad systems.
Answer: they all wanted to avoid problems between English and Indians
