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“Please tell me what is the distinction you make between “northern states” and “original northern states”.”

Here’s an example. Michigan is a northern state - fought for the union. But it was not one of the original 13 states - like, say New York.

So what you first referred to as the "northern states", and then (to be clear) you changed that designation to "the original northern states", you are now referring to as "the original 13 states". The original 13 states, prior to the end of business day July 4, 1776 are today referred to as the original 13 colonies, like, say Georgia. Some were in the North and some were in the South.

Don't think that the original 13 states weren't thinking about the land called Michigan. For example, from the inter-webs: "As the Continental Congress discussed the Northwest Ordinance, a Massachusetts delegate suggested adding a provision banning slavery in the Northwest Territory, which included the future states of Ohio, Indiana, Illinois, Wisconsin and Michigan. The Ordinance, including this measure, was adopted on July 13, 1787. It was the first time the federal government set limits on the expansion of slavery."