They conquered Greece, because at the time Macedonia was ruled by Alexander the Great (and before him his father) who became a major figure in history as he has conquered vast areas from Greece to modern day parts of middle East and even Asia.
Because Alexander had a strong military background and was able to conquer Greece (which was only the start) with relative ease, he further expanded his empire during his lifetime. He did all of this at a relatively young age because he died at the age of around 35 or so.
The Europeans never wanted a war this bad happen again, andere they taught communism could prevent this
That is because in many societies worldwide, families still don't want to send girls to schools because they don't think that it's a place where girls should go. Governments try to fight this with various incentives but often the cultural tradition is stronger than these incentives and this creates a society not based on equality. This is relatively common in underdeveloped countries.
Answer:
They wanted to form an alliance to keep from going to war with one another and to support each countries desire to expand its territory. policy of giving in to an aggressor's demands in order to keep the peace.