A metropolitan area is a good example of a functional region
<span>C is definetley describing conqiscadors all otehr three describes aztecs</span>
The correct answer is A. <span>He invented the automobile.
The automobile was created by a German engineer, Karl Benz, who owned the Mercedes-Benz company</span>
I believe the answer is "sectional tensions"
It did help lower shipping costs, and it did bring prosperity to towns, so it's either A or C, and I'm pretty sure it helped unite the growing country.