The correct answer to this open question is the following.
The pre-Columbian civilizations of Mesoamerica had in common the grade of advancement in the agriculture techniques that allowed them to farm the fields and grow crops to feed their families and trade with other tribes. Another commonality is the many gods the used to worship. They were polytheists.
Pre-Columbian civilizations differed in that not all were fierce warriors such as the Aztecs. They conquered many territories and forced them to pay tribute.
Among the most important pre-Columbian civilizations, we have the Toltecs, the Olmecs, the Aztecs, Mayans, and the Zapotecs.
Checks and balances, principle of government under which separate branches are empowered to prevent actions by other branches and are induced to share power. Checks and balances are applied primarily in constitutional governments.
Three out of five of the most populous countries in the world are located in Asia. Ultimately the highest population growth rate is also found there, the country with the highest population growth rate is Lebanon
