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The Inca civilization had three main natural barriers.

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Each official in the Inca civilization kept a detailed census.

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The common people in the Inca civilization had no freedom.

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The head of the Inca was called "Sapa Inca".

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The Inca civilization was located in south America.

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The Aztecs built causeways and bridges to connect the island to the mainland.

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Education was important to the Aztecs.

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The Aztecs captured prisoners for human sacrifice.

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The Aztec civilization worships multiple gods.

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Tenochtitlan was the capitol of the Aztec.

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The Maya civilization believed in multiple gods.

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Master builders in Maya used stones, bones, and wooden tools to build.

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Cities in Maya were centers of religion and learning.

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Farming was an important industry in Maya.

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The Maya civilization was covered by water on three sides.

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Most Olmec cities served as trade centers.

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The Olmecs believed in multiple gods and believed that the Jaguar god brought rain.

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The Olmecs are the oldest civilization in America.

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The Olmecs were known as the "mother culture".

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The Olmec civilization was first settled in southern Mexico.