I guess that it is related to the fact that americans love their icons. John wayne, davy crocket, wyatt earp, all heroes, all cultural icons, and all of them worthy of their places in history. If you ask a teenager (boy, what a challenge it will be) who john wayne was, you'll probably get an answer that says "hero." If they even know about bat masterson, bill hickock, sergeant york, general schwartzkopf, you will probably get the same answers. We are a nation of hero worshipers. Our money is covered with heroes, not queens. Grant. Franklin. sacajawea, even.
Ask those same teenagers about BRITISH heroes. blank stare. As those teenagers what a .45 is? It's an american gun that will kill you dead as a box of rocks, even if you miss. BHP? blank stare.
We, as a people, are very, very focused on ourselves. baseball, hotdogs, apple pie, and .45s. We may drink a lot of english beer (actually, now that I think about it, I don't recall drinking much english beer, just irish, scottish, and european) but we don't eat their food, and don't really want them interfering with our icons.
The closest you will get to finding a genuine british hero in american pop culture will be james bond.
That's it, IMO. We are americans. the.45 is american. we love america and the .45, and nothing else compares. The american people who like the browning, IMO, are like cat owners. the .45 is a dog owner's gun. The interesting thing about cat owners, is that you don't find many cat owners that HATE dogs, while the typical dog owner can't say a decent word about a cat. Same with the browning. A 1911 fanatic would rather use a slingshot than a browning, but a browning fan will still use a 1911 if he chooses to.