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How could the Beiyang Army come to dominate all of China? I'm no expert on Chinese Warlord era history but I'm guessing it can happen in a TL where a). Yuan Shikai doesn't die in 1916 and lives much longer b). Yuan Shikai doesn't declare himself Emperor c). the BA doesn't split after Yuan's death and passes on to a single successor d). the Beiyang Army is reunited by one of the warlords after the split or e). a combination of any of the above or some other POD happens.
What I'd really like to see is a Southern Expedition where the Beiyang Army goes South to defeat the Kuomintang and gain complete control over China like what Chiang Kai-shek did in the Northern Expedition but again, I really don't know how such a thing could happen.