Stop war

First of all, a war is an armed conflict or fighting between nations. Nowadays wars are a huge problem, in those conflicts a lot of people die and the others try to scape risking their life (you can see some pictures of the Syrian refugees here).
A lot of people suffer the consecuences of wars because some people who wanted power started a fight to conquer everything that they could and create a huge empire. This is what happens when people just care about themselves an don't think about the others or the consecuences. I think it's really unfair to conquer a country, take all that you can and then leave and let that country empty handed.
Wars are a huge problem caused by humanity and it has no good sides, so why does this problem still exist? Hoe could we make it stop? 
I think is nearly impossible but we should try hard because a war without wars will be worth all the effort and sacrifice. We should try to educate children, show them that violence is not the solution to the problems. This won't be useful at all if parents act violently in front of their children and make them think that violence is not bad. Changing the world is in our hand and we should do our best to live in a better world.