I don't think the Germans had any real territorial aims. They seemed mostly in countering Britain with an economic powerbase as well as acquiring more colonies. I think Belgium would still exist, but as a satellite of Germany. Their coastal ports would be completely under German control and Belgian Congo would be German Congo, thus Germany controlling the entire swath of central Africa. They would also take some land in France, not much at all, but some economically important areas in the NW, where there are coal and other natural recourses. In the east we'd see little border change as well. With Paris taken, which I believe would put France out of the war, the Russians would be still defeated at Tannenburg, and would more than likely sue for peace. They'd maybe lose some of Poland to Germany and forced to abandon support for Serbia, but little else would change. Even if economic and social situation got so bad in Russia that would allow for a socialist or communist revolution, the Kaiser I think would see the vested interests of keeping his cousin on the throne of Russia, possibly even offering military support. Britain, as a result of a quick end in the west, would simply shrug their shoulders, see to it that German colonial gains would be minimal, keep an eye on German ambitions, pack it up and go home. Austria subdues Serbia, probably w/o direct annexation, Italy, Bulgaria and Turkey never get into the war, so nothing changes with them. Japan is the only ally to gain some German colonies, which Germany feels they can lose, as they have gained Congo and economic control over continental Europe.
Of course, I could be wrong
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