This policy was called "containment" - the idea was to contain communism from spreading to new countries without trying to actively challenge the communist system in the countries that already had it.
This policy lead to some proxy wars, in which the US fought the Soviet Union for the free countries.
Because
he was scared lol
It’s where everything happens, like the big highlight of the story
In 1862, Congress passed the Pacific Railway Act, which authorized the construction of a transcontinental railroad The first such railroad was completed on May 10, 1869 Four of the five transcontinental railroads were built with assistance from the federal government through land grants.