Not quite correct. While the republic was proclaimed on 11/09/1918 and the Emperor abdicated two days later, the same formal state lasted until 1945 after being run into the ground by idiots (you've probably heard of them).

Damn French Frogs! I Curse your Pity nation!

Well I mean it was simple Google search but here's the source: https://www.google.co.uk/search?q=when+did+the+german+empire+collapse&oq=when+d&aqs=chrome.1.69i57j69i59j69i60l2j69i61j69i59.3320j0j4&sourceid=chrome&ie=UTF-8