Coins.
Civilizations often transcend Empires and are not dependent on their survival. For example, Roman civilization was both a Republic and an Empire.
Vast Empires
1) to facilitate trade
Egypt, the Fertile Crescent, China.
the British Empire
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.
religeon ~c=3
Many empires in history feel due to invasions.
APEX: The transition from river valley civilizations to classical civilizations.
They were both concerned with expanding their empires They had similar religions
There were many of them but the most renowned were the Aztec and Mayan civilizations.
Spanish Conquistadors destroyed both civilizations.