美国内战爆发前南北方矛盾的焦点是 A.是否发动对墨西哥战争   

美国内战爆发前南北方矛盾的焦点是

A是否发动对墨西哥战争                          B由谁担任总统问题

C是否对外进行领土扩张                             D奴隶制的存废问题

答案

D

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