Which of the following statements is true about the Northwest Ordinance? a. It defined the border between Canada and the United States. b. It set up a way for all new states to be admitted to the United States. c. It organized the postal service. d. It only affected the original thirteen states.

Correct answer is b. It set up a way for all new states to be admitted to the United States.

Explanation:

Option B is correct as this document was adopted in 1787 and according to it, it was established under which terms new countries will bee admitted in the Union.

Option A is not correct as it was established in 1818 along the 49 parallel.

Option C is also not correct as the postal service was established in 1792, although we can trace back its root to the First Continental Congress.

D is not correct as it affected all new admitted countries.

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