Which region of the US was based on mining?

Explanation:

Overall, 97% of nonfuel mineral materials was mined and quarried using surface methods, and 3% was mined underground. Most non-fuel mining activities took place in: Nevada, Arizona, Florida, Minnesota, Utah, California, Texas, Michigan, Pennsylvania, and Georgia.

b) trade is easy because of the direct line between their major ports. bilateral trade reached 89,6 thousand million.