Under James Monroe, the United States expanded by:

The answer is B

Explanation:

He was elected the fifth president of the United States in 1817. He is remembered for the Monroe Doctrine, as well as for expanding U.S territory via the acquisition of Florida from Spain

A

Explanation:

James Monroe expanded the united states by acquiring Florida from Spain

the correct answer is:

b) a rich merchant.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.