Discuss a number of similarities between Mesoamerican cultures and early river valley civilizations.

Some of the earliest Mesoamerican cultures included the Olmecs, the Mayas, and the Aztecs.  The Olmecs lived near the Gulf of Mexico, in “swampy, lowland river valleys.”  Water drains made out of stone, hieroglyphic writings, and a calendar, were a few of their achievements.  The Mayas lived in the Yucatan Peninsula of Mexico today.  Their priests were extremely good mathematicians and astronomers.  They developed a system of mathematics with 20 as the base, accurate calendars, and were the first Native Americans that developed a writing system.  The Aztecs lived in Central Mexico.  They were a very advance civilization with a network of canals, bridges, and causeways.  Some of their achievements included chinampas, artificial floating islands used for farming, and a calendar.

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Ibelieve the answer is c