Nietzsche was right - humans, at their core, are driven by the will to power. It's the drive to manifest one's will upon the world. That drive is the cause for

Nietzsche was right - humans, at their core, are driven by the will to power. It's the drive to manifest one's will upon the world. That drive is the cause for all wars and always has been. Sometimes someone with an extreme level of that drive makes it to the top while having control over a military, which allows them an extreme way to express their will. That's usually when wars break out. Julius Caesar, Genghis Khan, Stalin, Mussolini, Jefferson Davis, King George III, Hitler, Putin and on and on. The only way this stops is if it evolves out of us. That would take many thousands of years, but I don't think there's even selection pressure for this to happen. Actually, I think it's likely the opposite and we'll never lose the trait.