I know there's a question in that but I felt it was more akin to a statement - or provision of info which will hopefully be received with interest. DO bear in mind this is a general view, as in generalising - you will always find people of a differing view on any subject but general means most.
So, I have had many an American raise the question of whether Brits feel somehow aggrieved or regretful about the American war of independence - that America gained its freedom. The answer is, honestly, no. Not at all - we are happy for you, we smile and think it's a little odd/quaint when Americans over here celebrate July 4th - sometimes we join in.. well if there's a free picnic or party going on we're in!
But beyond that we really never think about it.. simply we don't care. Truly, it just never crosses our minds. We aren't taught about it in school and to be honest the only time I have ever had it come up in a conversation is when an American makes some kind of statement to the effect that we must feel sore about it. Truly no, if we feel anything on the matter we feel benign and we are generally speaking happy for Americans, we think you SHOULD be independent..Everyone should..
So, the fact is most of us don't even know about the American war of independence, let alone worry about it of have any reason to feel bitter about it. The reasons I say this repeatedly include;
1) it was a very long time ago...
2) to us it was a very small blip of a happening on a very, very long history full of events, wars, invasions (as in we have been invaded a good number of times) etc..
3) in line with the above - we, as a nation had many, many a war ... this is but one of many - it's just not that important to us and our history
4) It was also a VERY small part of what was happening for us at the time... This could also be part of why we lost.. we had so much going on..
5) our resources were stretched.. as we were involved in many countries at that time... and when you think about it... all this from what is a MINUTE little piddling Island.. from that point of view it's pretty impressive
6) we won some we lost some.. it's how it was.. we cannot hold it against everyone - this is the way of the world..No one wins them all need I say more?
America was founded by Brits in the main.. many are descended from British stock.. so in effect, when people blame Brit-land they are blaming their own forefathers... Other nations also settled in America.. and perhaps the mix altered things substantially but, and this is perhaps just personal opinion, but I see it as teenagers, we give birth to them, we raise them, we care for them, ok we sometimes do things they don't like and eventually they rebel and want to go their own way.. why should we resent America's independence - I see it as a natural step.. It was always going to happen, arguably rightly so.
I have some links which I will add below:-
https://americanrevolutionblog.blogspot.co.uk/2009/03/why-did-british-lose-american.html
"John Dickinson: Fortunately, the people maintain a higher regard for their mother country.
Dr. Benjamin Franklin: Higher, certainly, than she feels for them. Never was such a valuable possession so stupidly and recklessly managed, than this entire continent by the British crown. Our industry discouraged, our resources pillaged... worst of all our very character stifled. We've spawned a new race here, Mr. Dickinson. Rougher, simpler; more violent, more enterprising; less refined. We're a new nationality. We require a new nation."
But not to be forgotten in the evolution and growth of the US is the influence of France and the Louisiana Purchase during Thomas Jefferson's presidency - https://en.wikipedia.org/wiki/Louisiana_Purchase