BRAINLIEST IF CORRECT!
under james monroe, the united states expanded by:

C.

Explanation:  He is remembered for the Monroe Doctrine, as well as for expanding U.S territory via the acquisition of Florida from Spain. Monroe, who died in 1831, was the last of the Founding Fathers.

d

explanation:

        i'm fairly sure that the correct answers are 2 and 3.

        i used both my knowledge of world history and the process of elimination to obtain these answers. option 1 cannot be a possible selection because the mandate of heaven belongs to ancient chinese philosophical belief. option 4 sounds like it would benefit the region than detriment it. however, both 2 and 3 explain a potential reason for what could have contributed to the fall of the roman empire.

      hope this ! if i were you, i'd get a second opinion, because i haven't taken this course for a year. best of luck!

***websites that me understand the curriculum better last year are and ***