The Electoral college, consists of about 538 electors and it's also not a place it's a process. It's a constitution between election of the president votes.
I am not going to answer in a paragraph of 125 words, but I will give you the answer to the first question; The United States didn't want another country to fall to communism. They officially got involved after the attack of the Gulf of Tonkin (U.S destroyers were stationed there and a radio came in that said they had been fired upon by North Vietnamese forces). (45 words BTW).
I just want point tbh ok so Lemi answer this question lol and by the way have a good day