Advance
Tributary System
Direct rule comes at the cost of extensive investment in subjugating and pacifying rival groups. By instead installing a loyal official to rule locally and demanding they pay an annual tribute, we eliminate threats from any rival Āltepētl while filling our treasury at the same time.
Advance tree
The root of a tree in 
Traditions.
- Tributary System
Pyramid Architecture then 2 more
War Bonfires then 1 more
Modifiers
Definitionin_game/common/advances/region_north_america.txt:351
352starting_technology_level = 4
353depth = 0