The League of Nations was established
The three most important problems was that it gave to much power to the states (weak central government), it did not give the federal government the power to tax, and congress couldn't regulate trade.
Cuba threatened to start a war between the United states and the Soviet Union. The Cuban Missile Crisis was the closest the United States of america and the Soviet Union came closest to War. Ultimately it was resolved peacefully.
I think that the only right option is c. Workers had easier jobs and shorter hours. It caused lower quality of production
