Slavery was abolished in the United States territories in June 1862. Any new territory was not to have possession of any slaves after this date.
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The Thirteenth Amendment to the US Constitution outlaws slavery. (See related Link below, for more information.)Section 1. Neither slavery nor involuntary servitude, except as a punishment for crime where of the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction. Section 2. Congress shall have the power to enforce this article by appropriate legislation.
Consider this: Exactly which "people of those territories" wanted expansion of slavery. Definitely not any of the black people. Actually, nearly all the lobbying for slavery came from people living in the South who were anxious to gain more power in the House and Senate for their cause.
(Republicans)
Slavery would have been permitted in these territories. (Don't know if it happened.)
New Mexico and Utah