It is quite likely that the earliest people were Aleuts, who adapted to life in the Arctic. Over time, people migrated further south. C. Several distinct types of foragers developed, each type adapted to a particular climate. The Civilizations As we discussed earlier, civilization requires agricultural surplus. Patterns of civlization follow patterns of agriculture.
Different plants require different agricultural techniques.
This leads to different social patterns. Inca B. Meso-American 1. Swidden Agriculture Cultural, but not political unity. Cities are primarily religious centers, rather than residential. The Maya are the only American people to have developed a written language.