Add 1600 checkpoint: Song Dynasty splits into North and South

Song civil war (~1600-1610s):
- Korean war aftermath → military seizes merchant assets → capitalist rebellion
- Military coups civil government → capitalists launch 靖难
- Result: permanent North-South split (Option C)
  - North: military junta, industrial base, puppet emperors (Dong Zhuo parallel)
  - South: capitalist-civilian regime, trade wealth, legitimate emperor, no heavy industry
  - Independent: Western Protectorate, Sichuan warlord, Vietnam/Burma autonomous

Malacca falls to Aceh (Ilkhanate proxy)
Japan: unifies, invades Korea twice, fails, likely isolates
Mongol Khanate: recovers mining rights from Song capitalists
Ilkhanate: biggest winner — may surpass Song as leading industrial power

Plantagenet France: religious wars resolved, Scotland split (Lowlands→England, Highlands→Paris)
American colonies: condominium arrangement
Italy: scientific revolution begins, independent innovation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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