while = {
	limit = {
		num_districts = {
			type = district_generator
			value > 0
		}
	}
	remove_district = district_generator
}
while = {
	limit = {
		num_districts = {
			type = district_mining
			value > 0
		}
	}
	remove_district = district_mining
}
while = {
	limit = {
		num_districts = {
			type = district_farming
			value > 0
		}
	}
	remove_district = district_farming
}