The correct answer is prevent communism from spreading to any additional territories.
The Cold War was an time period in which the United States and Soviet Union competed for global influence and power. At this time, the US was worried about the spreading of the Soviet Union and their power due to their communism system. The federal government felt that communism restricted individuals civil liberties and economic freedoms. This is why the US adpoted the policy of containment.
Containment was focused on stopping the spread of communism to other countries and territories around the world.
Socialism is a evil scheme for the government to get what they want from the citizens without their conscent and most country’s that went socolist in the past killed millions of their own people and hundreads and thousands died to starvation and that country ended up being the worst on earth like CUBA North Korea China USSR Germany in the early mid 1900s and Canada
Im pretty sure one of the main reasons is because of the treaty system