Originally Posted by tore

Just off the top of my mind ..

The best way to ensure peace may be to have a totalitarian dictatorship that efficiently enforces laws that ensure peace and prohibits differences, disagreements, behaviours and situations that lead to conflict. If people are free to disagree, then conflict arises. For example, if people have the freedom to pursue different religions, then religions may clash. To keep the peace, it's better to outlaw all religions, perhaps save one.

It might also be helpful to eradicate cultures, dialects and to breed people so that mankind was more homogenous. Freedom of speech would obviously have to go and free press as well. Such a nation would probably attract the ire of neighbouring nations and so that could cause war on an international scale, but if such a nation came out the victor and could assimilate all of mankind, then peace could be maximized and war minimized.