Taiwan became important because an exile government of China was formed there that claimed to be the rightful government of China. This caused China to have two governments, one that ruled China which was the communist one and one in exile which claimed their right to have power over China but couldn't actually use that power in any way. The problem still exists today and other countries have mostly been neutral on this question.
The two governments, support each other in a federal system. The system is that in which the governmental power is divided between the central government and the territorial subdivisions. The federal government refers to the national government of the US.
B. Union soldiers outnumbered Confederate soldiers.
It was a humiliating defeat that pushed Cuba into the arms of the Soviet Union.