The correct answers are North Atlantic Treaty Organization (NATO) and Southeast Asia Treaty Organization (SEATO).
After World War II, countries like the US, Great Britain, and France were worried about the spread of communism. The system of communism used by the Soviet Union during this time was extremely brutal and individual citizens had few freedoms. This is why aforementioned countries created NATO and SEATO. NATO came first and was meant to create a political and military alliance between democratic countries. Countries that were a part of NATO agreed that an attack by a communist nation against any of them would result in all other countries of NATO supporting the attacked country.