Because it limits the amount of hours a worker is allowed to work while paying them living wage (which is usually more than they are being paid now).
The threat of communism on American ideals caused them to be very isolationist towards Europe and the rest of the world.
Known as the <em>Red Scare</em>.
I believe the answer is c) 17th amendment.
Hope this helps!
-Payshence xoxo
Refer to Daniel's prophecy as the leopard