Advance
Shared Brotherhood
United in the teachings of the Great Law of Peace, our people maintain a strong sense of brotherhood and unity, despite their disparate tribal background.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Traditions tree itself.
Modifiers
Definitionin_game/common/advances/region_north_america.txt:333
335icon = warriors_unity
336potential = {
337exists = capital
339OR = {
340original_capital.region = region:east_coast_region
341original_capital.region = region:canada_region
}
}