Simple answer: because they didn't want a communist government ruling over so many people. They used the excuse that the legitimate government was the one in Taiwan.
The 4th of July marks the day of our independence from the British.
Answer: because water and electricity doesn’t mix well
Explanation:
Both nations did not want to fight directly because of the threat of a nuclear Holocaust, They were the most powerful nations that spread influence and dominance to surrounding countries and fighting them directly would have started another World war.