A: They developed a system of crop rotation (he answered it right but made it confusing ig)

answer; i believe the two groups were irish immigrants and chinese immigrants;

it is a because im a fod nigba

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so.