Which group opposed the spread of slavery during the 1860 presidential election?
the southern democratic party
the republican party
the constitutional union party
the democratic party

The Republican Party is the correct answer.

The Republic Party opposed the spread of slavery during the 1860 presidential election and it was their key in the success of same election. They were of the opinion, that it would lead to slavery to remain confined to existing areas and eventually become extinct. They regard slavery as an immoral practice and even called upon Congress to stop its expansion. The Republic Party was truly an anti-slavery party.  

republican party,

Explanation:

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