The main result of the Northwest Ordinance of 1787 is that It created a system for creating new states.
The Primary aim of Northwest Ordinance is to create a system which help to create a way of creating future states in the region.
Another aim of the Ordinance is to create a platform for abolishing slavery and guaranteeing of fundamental rights which eventually became a part of bill of rights in the later years.
Hence, the main result of the Northwest Ordinance of 1787 is that It created a system for creating new states.
Therefore, the Option B is correct.
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