Soil quality and climate are the main factors for such high population density. Central Mexico has a high altitude above sea level (around 2000 meters or 6500 ft), allowing a temperate climate unlike the scorching deserts to the north, or the suffocating tropical rain-forests to the south.
Also, central Mexico's altitude is the result of strong volcanic activity, resulting in rich topsoil that allows higher agricultural yields and in turn, bigger populations.
It has the best farmland an climate, in high contrast with northern Mexico which is quite arid, and to southern Mexico which has a tropical climate.
The central interior of Mexico (also known as Centrosur) is composed by the states of Cuernavaca, Mexico and Federal District, where Mexico City is located. The total population of such region would be of some 25,246,764 people.
Mexico, Mexico city when its warm
Mexico City is already on central Mexico. If you mean direction to the actual geographical center of Mexico, it would be to the northwest of the city.
The Central Mexican Plateau or Mexican Altiplano.
The central Mexican plateau. The highest density would be found on Mexico City, within such plateau.
Mexico had less than 6 million people at the time.
New Mexico is the 36th Most populated US State.
The Central Mexican Plateau or Mexican Altiplano.
North Mexico and South Mexico
Due to volcanic activity, central Mexico is dominated by the Mexican central plateau, which besides its fertile soil, has a temperate climate -- unlike the scorching deserts to the north or the suffocating jungles on the coast. This has allowed a higher population density and more development along the region. Some of the largest cities in Mexico, such as Mexico City, Puebla, Queretaro or Guanajuato are located in Central Mexico.
Mexico has a far greater population density than Canada.
Mexico has a population density of about 142 people per square mile.