Well I think we could safely say the entire European Jewish populace would be non-existant.
Secondly we'd probably be speaking some form of German dialect.
Thirdly we wouldn't have our royal family.
Fourthly, there would be a German empire. Often something overlooked, it would be the size of Europe and large enough to compete with any other country on earth.
Fifth, I'd probably like sour crouth.
Sixth, the beers and wurst probably wouldn't be a bad thing,
Seventh, bah I give up, literally anything could have happened.