I am not sure what you mean. The war of independence against Britain involved a group of colonies not 50 states. Also we were the first European Country to abolish slavery and it took place decades before the American Civil War.
The 13 Colonies who rebelled against King George were ALL THERE WAS of the US at that time, and THEY were part of Great Britain legally. Their rebellion was just that a "rebellion." It was illegal.......no matter the moral right to do so, the legal right was not there. So, when Great Britain saw the Stars and Bars flying high, I'm sure they had pretty much the same feeling as when those sorry Yankees did at seeing the Confederate Colors flying proudly over the Capitol in Mobile.
As well, there were not 50 STATES during the Civil War........As for abolishing slavery decades before the Civil War, you better check your Historical facts. Only PARTS of the Slave Trade was abolished.......then again, IF YOU ARE CORRECT, than all those SORRY YANKEES who hate us Sutherners were WRONG. The Civil War WAS NOT fought to abolish slavery/free the slaves!