Help me with 3 and 4 please

Could anything have been done through compromise to stop it, or did it have to happen?

What was a challenge for president truman’s political agenda in 1950

Quick! what was germany’s main goal after world war i? a) to the united states develop the plan for the league of nations b) to make france return all of the territory it had occupied during the war c) to remain a world power d) to become allies with the united kingdom