so britons build hill forts to 'expand'. We give them (and other trible civs) only one "main civic center" then they expand through "colony" type buildings, brits, gauls, germs can all start doing it p1 with their hill forts, oppidums and encampments. Iber is a tribal civ but cant expand utnil p2 like other civs with its "castro". Castros are a liuttle closer to colonies, maybe a little stronger, id have to check all the stats. Where as the other 3 are weaker than a normal colony and defintely weaker than a cc.