While the majority of England's population is not what is depicted in the media as "tea-drinking-bloody-saying limeys", most of it's internet population as self centered bigots, who openly boast about the "greatness" of their country, and putting down America because we created our own culture after gaining independence, and we don't constantly praise England. See highest voted entries for verification.
Even as England complains about how Americans "all think we talk funny and are all posh and drink tea" they make equally brash generalizations about Americans, about how all Americans are "fat, disgusting, crude and play fake sports like American football" A lot of English people tend to use what happened hundreds of years ago as the main point of their arguments, thinking that their generation of people are the ones that "freed" America, when the majority of the English aren't even related to strong political powers during the 1700's, nor was America freed by English, but instead the war was won by America that earned America's freedom.
Some English individuals are incapable of accepting other people's cultures, since it is not their own, and therefore it is wrong.
America - "Why?"
England - "Because it's not like our football!"
America - "....."
England - "You should stop playing baseball! Why is it called the world series when it's only played in America?!"
America" One, just because it's not massively popular ni your country doesn't mean others should stop playing it, two, it's called the world Series because a large quantity of players who play in American Baseball teams are from around the world, and multiple countries play in the world series, namely Canada and Mexico. People do play baseball in England too, you know."
England - "Your culture is stupid, you call lager beer, which is wrong!"
America - "We're sorry that we have developed a different culture now, and part of that includes different words for different things."
England - "Well... your culture is stupid! And all American's are fat and disgusting!"
America "wow... Yes, around two thirds of American adults are considered over-weight, so are half of English people, with that number steadily rising."
England - "....... your still dumb!"
America - "The literacy rate for both America and England is 99%."
Together with Scotish enlghtenment (mainly based in Edinburgh) Welsh raw materials, Irish manpower. The English played a huge part in turning Great Britain into the first truly industrialised nation.
It also (again with the aid of the other home nations) formed the largest empire the world had yet seen. Strangely the English attempts at Empire had been successful but not greatly so, while the Scots had failed in panama. When the two combined however things really took off (strange)
The English also proved themselves to be a strong fighting nation both on sea and land and contrary to popular myth were equal to the other home nation regiments. For some reason many seem to believe that a race of people that sailed across the North sea and took over much of the fertile land of Great Britain and then fought virtualy non stop with Europe, should be considered pansies.
The English are now a hugely mixed group, however as they consider and take pride in their mixed basterdised background (creating a better stronger gene pool) this has had no real negative consequences unless a group is clearly segregating themselves (hence the dislike of the muslim veil)
The English relationship with the rest of the U.K. has been tense for many years in the past due mainly to the constant wars between themselves with no clear outcome other than pointless arguements over things that happened in the middle ages.
The main cause for dislike now is not so much cultural differences (as there are none to speak of other than accents)it is more of a dislike based on news reports wanting to create hatred. Football and Rugby matches that are treated like wars (its only a sodding game)and a sense of calling yoursef different for the sake of wanting to be different. This has been fueled by a largely pointless and over nostalgic view of the past in many celtic countries which now believe they can improve themselves by dressing stupidly and speaking languages that are basically defunct. rather like the Italians reverting to Latin on a whim or the English learning Anglo Saxon.
In short, England is the artistic and cultural heart of the world.
WE MAY HAVE A CRAP FOOTBALL TEAM, BUT WE INVENTED FOOTBALL, SO HOW BOUT THAT! in conclusion, England is a phenominal country, and has achieved so much!