1. era 4 saw many patterns of change. which changes occurred? choose all that are correct. a) people migrated to new places. b) old empires like rome were restored to their former glory. c) population increased as food production increased. d) the islamic religion spread throughout the world. 2. which empire develop the culture of modern day france and germany? a) abbasid caliphate b) silla c) carolingian which group of people migrated throughout europe, raiding and spreading culture? a) bantu b) chinese c) vikings