Which of the following declared that slaves could not be taken from their masters without due process of law; it effectively declared the missouri compromise unconstitutional?
compromise of 1850
emancipation proclamation
dred scott decision

The answer for this is "Compromise of 1850". 

The Compromise of 1850 is a set of laws dealing with the issue of slavery. California was admitted as a free state, upsetting the groups in favor of slavery and satisfying those opposing it in the U.S senate. In Addition, California abolished the slave trade by entering the Union as a free (no slavery) state. 

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