 It took almost 30 years for an elite interprovincial western union to emerge, when in 1936 the stronger senior clubs in Manitoba, Alberta and Saskatchewan formed the Western Interprovincial Football Union (WIFU).From the 1930s to the 1950s, the Big Four and WIFU gradually evolved from amateur to professional leagues, and amateur teams were no longer competitive for the Grey Cup.Apart from the World War II years, an amateur team last won the Grey Cup in 1936.