An American friend of mine (who is an intelligent bloke) asked me to explain it to him yesterday. I told him that there are five or six major cities in England that have 140-year-old "big club rivalries." Manchester, Liverpool, London (x2), Sheffield, Birmingham. I explained that all of these rivalries were between two clubs who, for the most part shared the success. Even in the case of Liverpool and ManUre, who had dominated the league for many years, their counterparts had enjoyed some levels of success either before, during or after those periods. Birmingham City are the exception, in that they have enjoyed virtually zero success and have been second-best for the entire-history of the rivalry. Added to that inferiority complex is the fact that, historically they were never legitimately considered to be a threat in the local area, and that smaller-population areas like West Bromwich and Wolverhampton (and even Coventry) have over-shadowed them. All of this serves to give them this massive inferiority complex which morphs into hate.