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the first feature that all civilizations have in common is that they all form around rivers
Both civilizations declined under circumstances that are still not entirely clear to historians.
they developed the concept of zero
Circumstances that helped the civilizations and diverse cultures of the Americas to develop in ways both common and unique are the early civilizations of the Americas created such vast empires with an advanced form of thinking and living. These civilizations lacked some of the essential tools that the Asian civilizations depended on to form there amazing empires.
Early civilizations were founded in major river valleys.
Circumstances that helped the civilizations and diverse cultures of the Americas to develop in ways both common and unique are the early civilizations of the Americas created such vast empires with an advanced form of thinking and living. These civilizations lacked some of the essential tools that the Asian civilizations depended on to form there amazing empires.
they all contributed to the declaration of independance
they are all known for their architectural skills
Both civilizations worshiped the sun god and practiced in human sacrifices. Their temples were also extremely similar in design. The periods in which they existed in Central & South America are also very similar (added to above).
the first feature that all civilizations have in common is that they all form around rivers
Human beings.
They were in fertile, well watered river valleys.