One of the most important accomplishments of the national congress under the articles of confederation was the creation of plans for both settling and governing the .

Northwest Territory, is the right answer.

Explanation:

Passed on 13th July 1787, the Northwest Ordinance was an essential act of the U.S. Confederation Congress. This act formed the originally organized territory, the Northwest Territory of the United States. The first reassert the ordinance of 1787 and, with scanty changes, restored it by the Northwest Ordinance of 1789.

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