During the Copper and Bronze Ages, three significant groups were the Baden, the Makó and the Ottomány (to not be confused with Ottoman Turks) cultures. The major improvement was obviously metalworking, but the Baden culture also brought about cremation and even long-distance trade with remote areas such as the Baltic or Iran. Turbulent changes during the late Bronze Age gave an end to the native, relatively advanced civilization, and the beginning of the Iron Age saw mass immigration of Indo-European nomads believed to be of ancient Iranian ancestry.