Not really the same situation in NK. But also the U.S. became what it is through standing up to the Brits. This goes for people too, at some point we all need to stand on our own. The U.S. isn't the worlds parent to run home to.
The Brits were also on the other side of the ocean, and we had substantial military support from the French. Things probably would have turned out differently if the UK could literally drive down the road to the colonies.
Ireland provides a good example. There were many Irish rebellions in the period from 1676 to 1876 (+- 100 years of American Revolution) some even with French support. However, Ireland was in England’s back yard and the English were determined to hold onto it and all the rebellions were brutally suppressed.
You act like the American revolution is the only instance of this. The French Revolution is another example of people fighting for change.