The Socialist Party believes the Conscription Act to be contradictory to the ideals of freedom put forth in the Constitution, which the US is based upon, and therefore should be abolished.
An appositive or appositive phrase is a noun or noun phrase that renames another noun right beside it.
For example:
"The insect, a cockroach, crawled across the table"
Therefore the only answer can be the first option.
Douglas that settlers in a U.S. territory could circumvent the U.S. Supreme Court's Dred Scott decision—which held that neither states nor territories were empowered to make slavery illegal—simply by failing to provide for police enforcement of the rights of slave owners to their slaves.