Which new world crops added the most calories to european diets and therefore positively impacted sustainable population numbers?
a. wheat and potatoes
b. potatoes and maize
c. maize and beans
d. tomatoes and peppers

After the success of the sputnik launch, the united states feared that they would never be able to launch their own satellite, the ussr had used technology developed by the united states, the soviets had superior nuclear capabilities, that any future us satellites would not be as successful.