“No colony had the right to secede from the British Empire.”
You are wrong.
The Treaty of Paris of 3 September 1783 recognized the United States to be free, sovereign and independent.
All British troops were removed from American soil.
Sorry, but that has to hold some sort of record for sheer empty-headed reasoning.
The Treaty of Paris of 3 September 1783 is more than 7 years after the colonies announced their secession from Britain, and it has no bearing on what King George thought about it in 1776.
I’m sure that even you are capable of understanding that King George disagreed with American secession, to the point of waging a major war to prevent it from happening.
So try again to sell the idea that secession from the British Empire was a ‘right’ acknowledged by London, not that you’ll be able to come up with something better than that last gem.