The Gibbons v. Ogden court case in a nutshell:
Ogden had a monopoly on operating steamboats on the Lower Mississippi.
Gibbons, who had a federal liscence to operate steamboats, tried to start business there and was sued by Ogden.
The ruling was that Gibbons would be allowed to operate there, which gave precedent to federal law over state law.
He says it is "mere" to show that it is an estimation
Answer:
The answer is D. Supreme Court
Isolated from Europe in the western hemisphere, but maintaining a strong grip on latin american countries (the roosevelt corrollary)