The South - Mexico City to the Yucatan Peninsula. Subsistence farming and plantations are found here in the poorest region of Mexico. Tourism is important. Mexico has industrialized in the past 50 years. Pollution - mountains surround Mexico City, trapping pollution in smog .
Farmers burn and destroy wild vegetation to grow crops.
Population Changes - Mexico can not provide jobs for its rapidly growing population of 92 million. Most of them live in the southern part of the Plateau of Mexico. Crowding and unemployment are common. Many come to the US, often illegally, to find work. Native Americans - came from Asia and traveled south.