For Dictatorship, the second answer is incomplete, a dictator may obtain power not only through elections but by a military or institutional coup d'état, a civil war or a military intervention by a foreign power.
In a republic, power is held by those citizens that are able and government is a public matter (res publica in latin) to vote and the power comes from their vote during elections.
When he first became President, the conflict with Japan was
still continuing. After the war finished there was trouble in Korea which
became an impasse after China move toward in to help North Korea. Obliteration
of Europe and Asia that required to be reconstructed. The Russians declined to pull
out their troops from Germany and Eastern Europe and remained in Estonia, Latvia,
and Lithuania. There were severe labor difficulties in the US Steel industry.
The US had to readapt to a peace-time economy and recuperate from the enormous
costs of WW II.
I have done some studying and I believe its tribalism.
I hope this helps :)
