RE: "This may or may not be true..."
It is true. The short and short of it is that the colonies were trying to pass laws to slow and get rid of slavery, and the crown was "prostituting its negative" (To use Jefferson's phrase) -
Basically we passed the laws and Britain vetoed the laws. The U.S. was born a slave state because Britain forced us to be born a slave state. Here you can find both audio and the original sources/source texts for the law Virginia passed, the full text of the veto, and the full text of a resolution imploring the king, on humanitarian grounds no less. "Please let us do this and help the slaves" Britain flat out said no.
https://librivox.org/short-nonfiction-collection-vol-093-by-various/ (Look at entries 09, 10, 11)
"I believe any fair minded person can understand why a slave in the U.S. would not appreciate the 4th of July. In other words, how can one celebrate the 'independence' of a nation in which he is a slave?"
This is a fair question, and the answer is as short as 10 words:
When a colonial power forces them to be that way.
“The U.S. was born a slave state because Britain forced us to be born a slave state.”
That is an interesting comment; one I’ve heard before but don’t fully understand.
Are you saying that the purchase of slaves by colonists in America was forced upon them by the British government?
Did the British government force the colonists to borrow money to buy the slaves?
If a colonist did not agree to buy slaves they did not want, did the British government punish the colonist in some way?
I had always thought the purchase of slaves was more along the lines of willing buyer/willing seller.