How did the Montagnard people become refugees?

They fled their homes in the middle of the Vietnam War.
They moved away to avoid assisting the US military.
They left mostly due to rising poverty after communists took over their country.
They escaped Vietnam after being persecuted by the communist government

when the united states took over

we need the diagram to answer this correctly.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.