just reached the critical point where it is capable of building cities.
The first step is to build one city and from there expand. As your
civilization grows, cities will spread over an entire continent, or
part of a continent, or over several islands and continents.

Each city acts as a giant processing plant for the food,
resources, and trade of the adjacent lands. The people of a city go out
and work the nearby farmland, mines, and forests, and the city converts
the result of their labor into more people, armies, cash, luxury goods,
temples, universities, etc. Raw materials are transformed by cities into
the power and the ideas your civilization needs to prosper.

FOOD that is collected feeds the local population. When there is
a food surplus the population grows. Your first city has a small
population that can only work part of the lands the city controls. As
the city population grows, more lands can be worked, increasing
production. Before long you can afford to send off settlers from the
first city to build another nearby, and then another.

RESOURCES are the lumber, metals, energy sources, and other raw
materials that are used in industry. Through the craftsmen and shops of
the city these resources are made into items useful at home or elsewhere
in your civilization. Larger cities normally generate more resources and
thus build things faster. Each city can build only one item at a time.
This could be a military unit such as a Phalanx or Battleship, a city
improvement such as a Temple or University, or perhaps a Wonder of the
World.

TRADE is generated by the highways of commerce: roads, rivers,
oceans. All nearby trade passes through the city bringing in luxury
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