Add 1475 checkpoint: Song dynasty crisis erupts, global ripple effects

Song Dynasty crisis (~1460s-1470s):
- Second cold wave triggers multi-directional fragmentation
- Southern peasant revolts, northern military takeover, Western Protectorate independence
- SE Asian colonies loosening, Korea recovering autonomy
- Dynasty persists in name but power fragmented (late Han/Tang parallel)
- Industrial production continues under military control — tech lead not lost

Global effects:
- Ilkhanate enters golden age, exploits Song distraction for Indian Ocean expansion
- Great Khanate accelerating decline (Northern Ulus near-independent, Poland/Byzantium loosening)
- Portugal: Atlantic direction confirmed, Columbus approaching
- Aragon: first North African outposts
- Plantagenet France: English nationalism emerging
- Burgundy: absorbed W. Lorraine, expanding toward Savoy
- Religious reform: printing press accelerating, formal Reformation likely within 25-50 years

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

0 files changed, 0 insertions, 0 deletions