The most difficult shocks for any civilization to survive are exceeding the incentives to organizing production, then, plague, and war.
Source date (UTC): 2016-02-17 13:38:00 UTC
The most difficult shocks for any civilization to survive are exceeding the incentives to organizing production, then, plague, and war.
Source date (UTC): 2016-02-17 13:38:00 UTC
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