With a Point of Divergence going as far back as 1351, the start of the Red Turban Rebellion, how could either a Han Chinese or Manchu/Mongol lead Chinese Polity control both Inner and Outer Manchuria in 2018?
The smallest borders allowed for such a polity are the Chinese polity controlling both China Proper and Manchuria (Inner & Outer) and the largest borders allowed as large as Great Qing at its maximum extent. Bonus points for the latter.
More bonus points for the resulting borders being as clean as possible, and another round of bonus points for China becoming/on the cusp of becoming a developed nation.
The smallest borders allowed for such a polity are the Chinese polity controlling both China Proper and Manchuria (Inner & Outer) and the largest borders allowed as large as Great Qing at its maximum extent. Bonus points for the latter.
More bonus points for the resulting borders being as clean as possible, and another round of bonus points for China becoming/on the cusp of becoming a developed nation.