Answer:
It forbid Native American lands from being taking from them without their consent.
Explanation:
The Northwest Ordinance of 1787 was an act enacted by the Confederation's Congress to provide for the settlement and political incorporation of the lands the U.S had acquired during the American Revolutionary War: the territory of the North-West of the River Ohio. The act aimed to do this incorporation in a peaceful and orderly way, and it forbade Native American lands from being taken from them without their consent, as outlined in Article III:
<em>The utmost good faith shall always be observed towards the </em><em>Indians</em><em>; </em><em>their lands and property shall never be taken from them without their consent;</em><em> and, in their property, rights, and liberty, they shall never be invaded or disturbed, unless in just and lawful wars authorized by Congress; but laws founded in justice and humanity, shall from time to time be made for preventing wrongs being done to them, and for preserving peace and friendship with them.</em>