Anti-slavery Whigs, Northern Democrats and Free Soldiers are the three groups came together to form the Republican Party. Hence, option A, D and E are correct.
A conference of Northern Whigs, anti-slavery Democrats, and Free Soilers led to the creation of the Republican Party. Horace Greeley was one of its founding members.
They conflicting the Kansas-Nebraska Act and back up the abolition of slavery in the American colonies.
Thus, option A, D and E are correct.
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