Which answer best describes an important outcome of the Gibbons v. Ogden court case? The case set definitions for navigation and
placed state control over all coastal and river trade. The case set definitions for navigation and placed federal control over all coastal and river trade. The case set the precedent for Congress to override a federal law when it conflicts with a state law. The case set the precedent for Congress to override a state law when it conflicts with a federal law.
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.
All of the other answers are unreasonable with this question the way I like to look at questions is to eliminate the most plasible answer that would be wrong and going through this it would have to be A because B C and D are unreasonable
A main reason that the age of revolutions initially failed to achieve widespread change in some nations of Europe was because many of these failed revolutions took place in the "backyards" of their mother countries--meaning that they were easily taken down with military power.