They started the korean war to prevent the spread of communism cause they associated communism with Russia. They did not like Russia .
"The Cuban Missile Crisis was Russia getting ballsy and really mad at us (Likely due to us having missiles in Turkey that could hit them)
And the Vietnam War was started for the same reason as the Korean War"
Answer:
Machines needed to be repaired less frequently. Products could be manufactured on an assembly line.
I honestly think it's B only because a majority of people did not want to vote so they created the Socialist party.
im pretty sure it was the Keatintg-Owen Child Labor Act
hope this helps <3