Besides the curse what are other possible explanations for the deaths

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: karl marx, max weber, and emile durkheim (the fourth could be considered georg simmel)

explanation:

the confederate at bull run

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same