Today's challenge. With a PoD in the mid-1700, have Oregon be colonized by the Dutch. Bonus points if they get cut off from the VoC or the Dutch mainland and develop their own "trekboer" culture, or even "Amerikaaner Republiks". Extra bonus if you get at least a few actual Boers into the colony.
User galanx made a similar development by having the Brits settle it through the Sea Otter Trade. I'd like to know how plausible this is.