The lasting impact of the Northwest Ordinance of 1787 was: D. that it provided instructions on how the U.S. should add new states to the U.S. in the future.
The US Congress of the Confederation adopted and enacted the Northwest Ordinance on the 13th of July, 1787
Basically, the Northwest Ordinance of 1787 allowed new states to join the Union from the Northwest Territory, as well as listing the Bill of Rights that are guaranteed to the people.
Also, lands were set aside for schools by the Northwest Ordinance of 1787.
In conclusion, instructions on how the United States of America should add new states to the United States of America in the future were provided by the Northwest Ordinance of 1787.
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