Why is the gulf coast important to mexico's economy?

it is the agricultural center of mexico.
it is the heart of the nation.
it is the location of most of mexico's industries.
it is the source of the nation's petroleum deposits.

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.