I don't understand your obsession with Alaska because "we need a tag" argument. I already said if we need a tag in the Cascadia region just make a fictional tag, because that's what an Alaska tag would be too, or even better, in my opinion, make Colombia. Also the argument about "people live there in game so we should be able to form it", that's a problem the game has right now with certain parts of the world being colonizable when frankly for EU IV's time those places were horrible to live in. To this day places like Labrador in Canada, which is colonizable in game, barely anyone lived there before and still to this day it's a very small population. And development doesn't represent population and unless you're proposing that frozen Alaska in 1527 or whatever is going to develop industrialization before anyone else and out of nothing then the population is going to be quite small. Last thing I'll say on this is why the hell would you even want a state in Alaska, you'd have no development and horrible resources, since EU IV doesn't represent oil. You'd move south, to the region of Colombia

and live in the more habitable land, which is represented by not having the arctic province modifier and higher base development.
When suggesting a new tag it needs to rather be a country that did exist during the time frame or shortly after or a regional tag that unites a culture group. Examples of post-colonial nation formables that work would be Acadia, Cuba, Yucatan or Florida to name a few.