What would have been the consequence of the Crittenden Compromise, if passed?

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The Crittenden Compromise was a proposal to amend the Constitution to guarantee the protection of slavery in states where it already existed and to extend the Missouri Compromise line to the Pacific Ocean, allowing slavery in some western territories. If passed, Congress would not have been able to bar slavery from territories, which could have led to further expansion of slavery in the United States.

What Would Have Been the Consequence of the Crittenden Compromise