Football in Australia refers to numerous codes which each have major shares of the mainstream sports market, media, broadcasting, professional athletes, financial performance and grassroots participation: Australian rules football, rugby league, rugby union and Association Football (popularly known in Australia as "soccer"). There are four pre-eminent professional football competitions played in Australia: the Australian Football League (Australian football), the National Rugby League (rugby league), Super Rugby (rugby union) and the A-League (soccer). By most measures, including attendance, television audience and media presence across the most states, Australian football is the most popular nationally. However, in the states of New South Wales and Queensland, rugby football (including league and union) is overall the most watched and receives the most media coverage, especially the Rugby League State of Origin contested between the two states referred to as “Australian sport's greatest rivalry”. In recent times there has been an increase in popularity in Australian football and corresponding decrease in popularity of Rugby union in New South Wales and Queensland. Soccer, while extending its lead in participation rate particularly in the large cities and improving its performance at the FIFA World Cup, continues to attract the overall lowest attendance as well as media and public interest of the four codes. In Australia it is not unusual for football fans to follow or play more than one code of football and spectate major events from multiple different codes, though strong lifelong allegiances are evident in some where football cultures are most ingrained. Immigration to Australia and internal migration have had a significant effect on football followings in parts of Australia, and even has an influence on where Australians move. Prior to the Federation of Australia there was no dominant football code and football was played under a variety of rules since 1829. By the 1860s, Australian football and rugby became entrenched in Melbourne and Sydney respectively. The first intercolonial football matches were being played by 1870s and led to the formation of the first intercolonial governing bodies in Australian rules and rugby. Soccer or "British Association Football" was first introduced in the 1870s, although it has struggled against the full contact codes it has increased in popularity since the 1890s. Women's soccer dominated female participation from the 1920s until recent times when the organisation of Women's Australian Football saw it boom in popularity. Strong Australian regional rivalries have helped keep a regional football code divide