The Era indicator is show next to your Country Value at the top of the screen. Your population, ecology rating, and possibly some of your buildings influence your country's era.
The first era is "Small Village". Requirements for the next era "Large Village" can be seen by clicking the era indicator. For example, to reach the "Large Village" era, your population must be greater than 120 residents, ecology must be above 120, a Taxi Stand must be built and the "Landscaping" task must be complete.
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