LONDON — In this post-Brexit, mid-pandemic moment in the United Kingdom, with its economy battered by recession and the royal family in mourning and turmoil, it is hard to find a topic that unites this fractious nation. But U.S. chickens — yes, the lowly, clucking farm animal, consumed daily by the millions in all 50 states — have done it.Everybody hates them.The odd thing is that U.S. chicken is not sold anywhere in Britain, and if people here get their way, it never will be.What precisely have U.S. chickens done to so thoroughly appall the British, even though …
