革新
刀耕火种
有一种农业技术是通过焚烧植被来获得富含营养的草木灰为土壤施肥。我们已经了解到，通过这种技术，土地会更具肥力。因为土地知晓其曾化为灰烬之因，故而能结出更为肥硕之果。
审查法律革新requires革新树
修正
食物产出 %+10%
定义in_game/common/advances/region_north_america.txt:259
261potential = {
262exists = capital
263OR = {
264original_capital.region = region:east_coast_region
265original_capital.region = region:canada_region
266original_capital.region = region:great_plains_region
267original_capital.region = region:aridoamerica_region
268original_capital.region = region:west_coast_region
269original_capital.region = region:alaska_region
}
271NOR = {
272original_capital.area = area:xalisco_area
273original_capital.area = area:zacatecas_area
}
}