I think you may have misread the emotional content in his post. I didn't see much emotion in the stuff you quoted, certainly not the same as you seem to read in it.We actually had quite a few civil wars.
History is one of my great interests, the one people call the Civil War when Charles the First was beheaded and the Commonwealth formed is of great interest to me as Cromwell invited Jews to come back in the country, they had been expelled in 1290 CE and returned in 1656 CE.
In the same amount of time? Are you sure? We start school at four and a half, leave at 16 or 18, a lot of years to learn history. University and college is extra years. Apart from the obvious that the history of the Americas is also the history of Europe ( who did you think 'settled the country' if not Europeans? You seem to be very defensive about your couple of hundred years history while forgetting the interdependency of your history with ours. Did you know how many people were driven to famine and poverty in the UK because of your Civil War? Look up 'Cotton Famine'.
You stated you knew little, I posted a link to help with that, what are you so crotchety about this?
if Americans are so 'not bothered' about what you call the British 'occupancy' ( think you need to research more about that)why do so many Americans search for British roots? Many Americans at the time didn't 'rebel' against the British, they were paying far less tax than British people and had the same amount of votes as they did.... ie not very many. Universal suffrage didn't come for a very long time and it came in the UK a long time before it did in the US ( 1965 for black people in the USA)
Learning what you are taught and learning the truth are often two very different things, you always have to bear than in mind.
if you really want to get Europeans and Brits mad you should start quoting the US version of the Second World War.