Because northern Mexico is sparsely populated due to the scorching Sonoran and Chihuahuan deserts, as well as the mountainous terrain located near the Sierra Madre mountain ranges. This also makes building better road infrastructure a lot harder.
See related links for a couple of examples on the kind of terrain located on northern vs. central Mexico.
It is hard to grow crops in the hot dry northern areas that is why Mexico's northern area has less people that its southern part.
Because it has a very low population density and a pretty rough terrain in such region.
Canada has fewer. Mexico is ranked in the second place world-wide with 438 species of mammals.
Fewer indentured servants arrived as conditions in Europe improved.
The northern hemisphere receives fewer direct rays from the sun in January.
yes
Canada. It has a population of 34.3 million while Mexico has a population of 114.98 million (2012 est.)
There were many fewer of them.
The South had fewer large cities than the north.
The South had fewer large cities than the north.
The South had fewer large cities than the north.
Actually there are many countries in the Northern Hemisphere that have fewer lakes than Canada. Canada has lots of lakes. Really a lot.
They did NOT have slavery. Only the south did.
The South had fewer large cities than the north.