WI: British Version of Northwest Ordinance of 1787

What if, after the American Revolution, the British Parliament adopted an equivalent of Northwest Ordinance in the late 1700's (though with a close margin)? (temporarily disregarding the minimal chance for this kind of event to happen) What will be the effects of such actions when this Orinance is passed by a tight squeeze? Will this Ordinance decrease the chance of independence of British's various colonies? Or will the diverse racial and cultural differences render the Ordinance ineffective?
 
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