Agriculture, the first step in the Economical <l:6,66>Advances<e> branch, opens the earth for regular harvest. This leads to first <l:6,104>cities<e> and marks the true beginning of a Civilization. It allows to build <l:1,4>Settler<e> unit which can <l:6,48>found<e> a new city, the unique <l:2,0>Capitol<e> improvement to bind together the people of a Civilization and <l:6,119>Infrastructure<e> required to master the landscape.