I think the answer is the treaties!
Answer:
the Second was characterized by the build out of railroads, large-scale iron and steel production, widespread use of machinery in manufacturing, greatly increased use of steam power, widespread use of the telegraph, use of petroleum and the beginning of electrification. It also was the period during which modern organizational methods for operating large scale businesses over vast areas came into use.
Explanation:
C. A judicial branch was established to interpret the law. for apex
or
states courts were given the power to interpret federal laws as they applied to them
