era_1 = { #Pre-1836
	technology_cost = 5000 # for progress bonuses, use an approximate third: 1650
}

era_2 = { 
	# 1836-1856, originally 1836-1861
	start_date = 1836.01.01 		#Start of this era
	end_date = 1856.12.31 		#End of this era
	technology_cost = 6800 # for progress bonuses, use a third: 2500
}

era_3 = { 
	#1857-1876, originally 1862-1886
	start_date = 1857.01.01 		#Start of this era
	end_date = 1871.12.31 		#End of this era
	technology_cost = 8800 # for progress bonuses, use an approximate third: 3000
}

era_4 = { 
	#1877-1901, originally 1887-1911
	start_date = 1882.01.01 		#Start of this era
	end_date = 1901.12.31 		#End of this era
	technology_cost = 10000 # for progress bonuses, use an approximate third: 4000
}

era_5 = { #1902-1936
	start_date = 1902.01.01 		#Start of this era
	end_date = 1936.12.31 		#End of this era
	technology_cost = 11000 # for progress bonuses, use a third: 5000
}