Which of the following promises made in the northwest ordinance of 1787 were not kept by the united states government in the ensuing years? a.) the prohibition of slavery. b.) the creation of schools and promotion of education. c.) consent of and fair compensation to the native americans for their lands. d.) the right to property.

Consent of a fair compensation to the Native Americans for their lands

Explanation:

The Ordinance directs that “the utmost good faith shall always be observed towards Indians; their land and property shall never be taken from them without their consent.”

On the same Ordinance a new method for adding new territories and States was providen. This allowed the U.S. "to expand its boundaries to the Pacific—which would result in the taking of lands from hundreds of Indian tribes".

Reference:  U.S. National Library of Medicine. “The Northwest Ordinance Guarantees Tribal Land Rights - Timeline - Native Voices.” U.S. National Library of Medicine, National Institutes of Health

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coz they had the rank system in society according to the economic power of the people

the constitution of the united states gave congress the absolute authority over immigration laws