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!