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What is the connection among sectionalism, slavery, and states’right as causes of the civil war? how did the southern response to the 1860 election results demonstrate this connection

Which of these statements best describes the ambiguity in this excerpt

Which of the following was not an effect of westward expansion? a. native american tribes suffered confinement on reservations. b. native americans learned new techniques of irrigation. c. many native americans died from the spread of disease. d. natural resources were depleted from misuse by white settlers.