The formation of the North Atlantic Treaty Organization (NATO) and the Southeast Asia Treaty Organization (SEATO) were attempts by the US and other nations to do what?

Answer 1

NATO was a cold war organization that would help combat the USSR from attacking the US or one of its allies. Simply put, an attack on one is an attack on all. So if the USSR attacked France, for example, the other members of NATO would come to France's defense and all would be engaged in a war with the USSR. The USSR created their own version of this, called the Warsaw Pact