The united states entered world war i in april of 1917 for all of the following reasons except
a) the sinking of the lusitania

b) unrestricted submarine warfare

c) strained relations with mexico

d) zimmerman note

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.