Anybody good in history and wanna help me answer #1-3? Free Brainliest and point ...

Answer:
1) Because, should they attack us, we would respond with massive retaliation aka nuclear weapons
2) It is when you try to achieve an advantageous outcome by doing dangerous things and almost pushing things to the point of conflict
3) First, he tried to prevention by giving them aid. if that didn't work, he used force by killing and replacing their anti-american leaders with pro-american ones they chose
Explanation: