Answered

The Freeport Doctrine stipulated that

Apopular sovereignty superseded the Kansas-Nebraska Act
Bthe Dred Scott decision voided the notion of popular sovereignty
Cslavery could be prevented by states passing laws unfriendly toward

the practice

Dthe Kansas-Nebraska Act was unconstitutional under the Dred Scott

decision

Ethe Fugitive Slave Act was unconstitutional in territories gained from

Mexico

Verified Answer :

In general, the Freeport Doctrine stipulated that "(C) slavery could be prevented by states passing laws unfriendly toward the practice," since it held that this would cause slavery to eventually "die out". 

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