"era" - key terms from Wikipedia

apartheid era
attitude era
baroque era
christian era
civil war era
classical era
colonial era
common era
constitutional era
contemporary era
cosmic era
cosmic era	human enhancements
edwardian era
elizabethan era
era
era	champions
era	name
era	names
era	of the united states
era	vulgaris
factions of the cosmic era
feudal era
golden era
heisei era
jacobean era
list of cosmic era
list of cosmic era	factions
list of cosmic era	locations
messianic era
modern era
napoleonic era
nazi era
new era
open era
paleolithic era
progressive era
reconstruction era
reconstruction era	of the united
roman era
romantic era
second constitutional era
silent era
soviet era
swing era
tang era
victorian era
vietnam era	veterans
voted to ratify the era
vulgar era
warlord era