The Republican Party emerged in 1854 to combat the Kansas–Nebraska Act and the expansion of slavery into American territories. ... The party opposed the expansion of slavery before 1861 and led the fight to destroy the Confederate States of America (1861–1865).
They weren't too eager to get involved in a war which they didn't know the outcome, and they didn't want to become involved because of the impact it may have on their trade with the other countries.
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The vice president of the United States serves as president of the Senate and therefore its presiding officer. hope this helps in anyway!
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