Originally Posted by Prinsara
You could say "by disliking his nephew". Edward was aiming for peace with the Entente Cordiale, though, not military action.
If anything, the Triple Entente should have stopped the war, when you actually get down to the events of the summer of 1914 ... Austria-Hungary must surely have known that Russia would back up Serbia, and so, knowing that the Triple Entente existed, might have thought twice about potentially aggravating Britain and France by association, but evidently didn't. And what actually brought Britain into the war was the German invasion of Belgium, and Britain's agreement to protect Belgium went right back to before Edward was even born. There are a lot of reasons why the Great War happened, but Edward VII's actions aren't amongst them.