WW1 was a big desaster to all countries in Europe. Many proud and wealthy and civilized nations were ruined. Millions were killed, millions suffered. And what for?
I read books and I think I almost understood how this war happened. However, I have no idea why no person or nation made serious attempts to stop this war. Why not after Tannenberg. Then it was clear that it was going to be a long war. German attack in the west had failed, Russian attack in the east had failed. Why didn't they just stop it?