Lenin's first big achievement was signing a separate peace with Germany and getting Russia out of the war, which was helpful to him since he needed to fight a civil war that wouldn't end until 1922. This might have helped Germany, too, except the US entered the war on the side of the British and the French, which led to another outcome of the war, increased geopolitical influence for the US. The US was already becoming a major economic power, and being able to avoid the destruction and loss of manpower associated with World War I certainly didn't hurt. The war helped catapult the US from being a debtor nation to a creditor one, and Wilson's leading role in negotiations at Versailles, even though he didn't actually get what he wanted, made America a big player on the world stage for the first time. Thanks, Thought Bubble. But just so we don't get completely Eurocentric, another major outcome of the war was the end of the Ottoman Empire and the emergence of the nation-state of Turkey. The rest of the world saw some change, too, but not much for the better.