The statements that best describe how the Northwest Ordinance established a method for settlement are:
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It provided a procedure whereby new states could become part of the United States.
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It established laws that gave basic rights to settlers.
The statement about ensuring that any Native American living in the territory would become a citizen is not correct, as the ordinance did not guarantee citizenship to Native Americans. The first statement about new territories becoming part of an existing state is also inaccurate, as the ordinance focused on creating new states rather than incorporating territories into existing ones.