I wrote this
https://www.alternatehistory.com/discussion/showthread.php?t=357620 on this very topic. While the POD can be argued that it wouldn't cause the US to dissolve; the rest of what would have happened is much more realistic of how the 13 (14 if you count already independent Vermont) would fare. I find alot of WI's regarding this topic to be highly unlikely in attempting to butterfly away Manifest Destiny when Manifest Destiny was already (except without a name) established in the minds of all American colonies for over 150 years by the time of the US Revolution. MA, CT, PA, VA, NC, SC, and Ga (7 of the 13) had original charters stretching sea-to-sea and an 8th, NY, had vast claims west to the Illinois River and south to the Tennessee River. Westward settlement, taking Louisiana, Texas, Oregon, etc is going to happen, you can't butterfly it away based on the US collapsing. Americans will go west with or without current government following them; Daniel Boone went to Missouri under Spanish authority, hundreds went to Texas under Spanish and Mexican authority, Mormons went to Utah while it was still Mexican.