What is a frontier? a. a territory that has just been settled
b. an area of rich farmland
c. a boundary line between settled and unsettled lands
d. a row of navy ships

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.