What allowed native americans in mexico to settle cities larger than those in areas to the north

What is the area of the trapezoid shown ?

According to thomas hobbes concept of the social contract, what do people exchange for the protection by the government?

Me! these questions are based on american people in the south essential questions: question 1: for what reasons will one group of people exploit another? focus questions: question 1: what influenced the development of the south more: geography, economy, or slavery? question 2: what were the economic, political and social arguments for and againsts slavery in the first half of the 19th century.