No
The legislative branch creates the law, and the president (executive) can veto (deny) it to be passed. if the president doesn't veto it, the law goes into effect.
Therefore you only need 2 branches
The Vietnam War was part of the Cold War for it was supposed to try to stop the flow of communism to the rest of the world it was also known as the domino affect.
That is an interesting question, thats just how it was writtern
First president of the u.s hehehe