the salk poliomyelitis vaccine was tested on ~1 million children in 1954. in early 1955 the data came in that the vaccine was efficacious and safe

Based on the information in the chart of the independent in the senate chose to vote with the republicans in the senate the republicans would

What job did president george washington give to thomas jefferson?

Who was william johnson? a. a revolutionary war veteran b. was the most prominent free black in mississippi c. a field slave d. inventor of the cotton gin