c. The establishment of global empires
The Industrial Revolution. It added many machines and factories which in turn provided many jobs for many Americans.
"They developed an extensive system of paved stone roads" is the one factor among the following choices given in the question that a<span>llowed the Incas to use their military efficiently. The correct option among all the options that are given in the question is the first option. I hope the answer helped you.</span>
