The Dominique lays a brown egg; which hardly makes it a "distinctly European" bird. Ahh, but did it always lay a brown egg? The Dominqiue type is distinctly European. It seems to originate from what was found in the family chicken coop Which in the early days that demarcate Dominique uniqueness originated from Europe- including additions of surplus "living food" brought back on ships that traded all around the world.
Plymouth Rocks did not displace Javas and Dominiques because of their beauty. Rocks are larger than Dominiques, and provide a larger carcass for meat; and Rocks mature and grow more rapidly than Javas, meaning less feed and less time before a bird is either laying or ready for the table. At the beginning of the 20th Century, the advice to poultry farmers from many in such occupations as the Poultry Science departments and the Bureau of Animal Industries was that if the farmer intended to egg ranch he needed white Leghorns, and if he intended to raise dual purpose or meat birds, he should confine his attention to Plymouth Rocks, Rhode Island Reds, and White Wyandottes. Actually, the excellence of barring was early on a major factor in the popularity of breeding the Barred Plymouth Rock, although you are correct in the statement about them maturing more quickly than Javas. In the beginning of the rise of Plymouth Rocks, in the 1800's, Dominiques and Rocks were often coming out of the same flocks. There is a period that spans over many years that the breed is differentiating itself, and in that time period quality of barring played a significant role. By the beginning of the 20th century, Barred Rocks, had soundly displaced both Javas and Dominiques. It's not a time period, however, to consider in discussing how they emergedschool". That they were early on recognized for productive excellence is why I mentioned them at the forefront of my list in the original post. It is also why they are the first breed and variety described in the Standard of Perfection where great attention is, and has consistently been, given to the exactitude of the barring.
There have been two distinct strains in poultry raising sense the days of the "Cochin Craze" or "Hen Fever." One has been to breed for appearance; the other has been the effort of farmers, raisers, and later agricultural colleges to produce more meat and eggs with little or no attention to looks. This is not accurate. They were not divided into distinct and discreet camps for a very longtime. There have, indeed, been many poultry projects over time, but between 1850 and 1950 there was a whole lot of blurring of lines between the camps. By the 1930's schism and division is becoming clearer until the post-WWII period where it sets in strong. The "Cochin Craze" days marks the very beginning of poultry the way we think of it today, and it would take them decades just to sort out the first composite breeds. They most certainly were not divided into camps based on production and exhibition. Of the earlier, 1800's composite breeds, the breed most closely aligned with production from its inception was the Rhode Island Red, which also explains why it took so long to standardize it.
The Holy Grail of American poultry men in the first half of the 20th Century was to produce a white egg laying yellow skinned bird as Americans preferred white eggs and yellow skinned table birds. In Britain, the Holy Grail of poultry men was a brown egg layer with a white skin to reflect British preferences. Few people realize that until the 1950s, the British were more likely to see rabbit than chicken on their tables. A breed that is considered British is the AmRock, essentially the result of the importation of utility Barred Rocks that did not reflect the British standard for Plymouth Rocks but these birds were prized by farmers for their productivity. In Britain, the niche filled here by Barred Rocks apparently was heavily occupied by the AmRock,. I would think that describing these projects as the "Holy Grail of American poultrymen" would be a bit of stretch, which is why those breeds which were developed to meet the perceived niche were generally unsuccessful. The "Holy Grail" of the early 20th century was--hands down--the New Hampshire, this joining the already established ranks of Plymouth Rocks and Rhode Island Reds, with a nod to Wyandottes who never really could move out of the shadow of the Rocks. No other American breeds ever competed with these in stature or distribution. The white egged, yellow skinned, dual purpose breed was fairly well achieved in the Lamona; it did not catch on, because the perceived niche wasn't all that important at the end of the day.
If you read the origins of many contemporary British and European breeds, one finds that judicious additions of American dual purpose birds was used I their final development. I'm not sure what you actually mean here.
The Cornish (sometimes called Indian Game) isn't considered an Asian breed since it apparently resulted from the crossing of British game birds with imported game fowl. The goal was to produce a superior fighting chicken for cocking - but what the result had the wrong shape for fighting and a great shape for eating. Yes, indeed, and in qualities it sticks out like a sore thumb from the rest of the British class being in all things distinctly Oriental. What in it that is British, is the British talent for taking a random breed type and transforming it into a truly appreciable meat bird: Dorkings being Mediterranean type birds bred for meat; Redcaps being Hamburgs bred for meat, and Cornish being Asil-esque games bred for meat.