Instead of 6 eras make 3: Ancient, Medieval, Modern. For now nations changes too fast. You have no time to remember your opponents.


Make 5 regions:


1) Europe

2) Far East

3) Near East

4) South Africa

5) America


While changing your nation, you will be forced to choose it from the same region. So we won't have such ridiculous choices as Babylonians turning into Maya, or Romans into Mongols. Futhermore the game will become more predictable. So you'll be able to make your strategy, knowing, that your opponent Maya can turn either into Aztecs or into Incas, not into anyone in the table.