Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.
it bans slavery
They lived among the Hidatsa and Mandan Indians in the upper Missouri River area (present-day North Dakota). In November 1804, an expedition led by Meriwether Lewis and William Clark entered the area. ... Lewis and Clark met Charbonneau and quickly hired him to serve as interpreter on their expedition.
Protecting citizens against foreign and domestic terror and threats
