What unresolved conflict was made worse by adding more territory to the united states in the early to mid-1800s

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. 

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;