Here's a qoute from Soren Johnson in a recent interview:
Our use of history was largely as setting - the game is not intended to be an accurate historical simulation. However, it's not quite that simple as much of the joy of playing the game is recognizing aspects of real history. Civs along rivers and coast experience better trade. Controlling strategic resources (iron, oil, uranium) is very important. Balances of power shift when new military and economic technologies become available. Further, players have fun faster when they understand the game quicker - and this is more likely to happen if people recognize parts of history they already know in the game.
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