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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.
What else can I help you with?
What country has fewer amount of mammal species- Canada or Mexico?
Canada has fewer. Mexico is ranked in the second place world-wide with 438 species of mammals.
What cause an increase in the number or slaves in the northern English colonies?
Fewer indentured servants arrived as conditions in Europe improved.
What hemisphere receives fewer direct rays from the sun in January than in?
The northern hemisphere receives fewer direct rays from the sun in January.
Does Canada has fewer lakes than any other country in the Northern Hemisphere?
yes
Which country has fewer people Canada or Mexico?
Canada. It has a population of 34.3 million while Mexico has a population of 114.98 million (2012 est.)
Why were railroads less influential in southern states than in northern and midwestern ones?
There were many fewer of them.
What is one way southern and northern societies differed in the 1800s?
The South had fewer large cities than the north.
What is way in which southern and northern societies different in the 1800?
The South had fewer large cities than the north.
What is one way in which southern and northern societies in the 1800s?
The South had fewer large cities than the north.
What caused an increase in the number in the northern English colonies?
Fewer indentured servants arrived as conditions in Europe improved.
What was the main reason new England colonies had fewer slaves than the northern colonies?
They did NOT have slavery. Only the south did.
What caused an increase in the number of slave in the northern English?
Fewer indentured servants arrived as conditions in Europe improved.
