Why might most of the major pre-columbian mesoamerican civilizations have existed in the areas of southern mexico?

Because the south had a favorable climate for agriculture and a variety of natural resources.

Explanation:

The Mexican territory is formed mostly by 70% of mountainous regions (whose mountains do not exceed 3,000 m of altitude) and the rest by plains. The north of the country is arid and in the south there is Atlantic forest. The Aztecs controlled a large empire that included almost all of central and southern Mexico; they chose the southern region of the country because of the favorable agriculture climate, which was the main activity of the Aztec community; and because of the natural resources provided by the Atlantic rainforest.

a small town is a good definition for new france in 1750. new france was the area colonized by france in north america. the area is nowadays the city of quebec in canada.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.