Because they wanted to protect people's liberties. also because they wanted to ensure the rights of the people and that they were protected from the government.
It strengthened Fidel Castro's position. The bay of pigs was a failed attempt to remove him from power. When it failed the U.S was exposed as trying to start a revolution with one of their "allies". This really hurt the U.S in the future because it led other countries not to trust them.
It was B. border dispute with Mexico