Improved Trade Ships

Advance tree

1. New World
2. Colonial Charters
3. Exploration Fleets
4. Improved Trade Ships
5. Advanced Extraction Techniques then 12 more
6. Ainu Trade Only some countries
7. Bodhisattva Only some countries then 2 more
8. Control of the Izumi Sea Only some countries
9. Reformed Coinage Only some countries
10. Control of the Tōkaidō Only some countries
11. Welcoming the Nanban Trade Only some countries
12. Countering Piracy Only some countries
13. The Arsenal Expansion Only some countries
14. Diplomacy Through Tsushima Only some countries
15. Bahan Ship Only some countries
16. The Alluvial Land Grants Only some countries