Here are some Midwestern groups:
United Motor Contest Association - Kansas, Oklahoma, Nebraska
1952: Mickey McCormick
1953: Gordie Shuck
1954: Cotton Musick
1955: Walt McWhorter
1956: Walt McWhorter
1957: Mickey McCormick
United Speedways of Indiana (after the first couple of years the Indiana changed to America) - Indiana, Illinois, Iowa, Missouri, Kansas
1954: Johnny Noble
1955: Wilbur Robinson
1956: Frank Wright
1957: Harold Leep
1958: Harold Leep
1959: Charlie Lutkie
1960: Ray Duckworth
Big Car Racing Association - Colorado, Kansas, Oklahoma
1958: Roy Walker
1959: Gordon Herring
1960: Jack Hahn
1961: Gordon Herring
1962: Gordon Herring
1963: Eddie Jackson
1964: Jack Hahn
1965: Grady Wade
1966: Jay Woodside
1967: Roy Bryant
1968: Roy Bryant
1969: Jan Opperman
1970: Lonnie Jensen
1971: Jon Backlund
1972: Lonnie Jensen
1973: Edd French
1974: Steve Troxell
1975: Jan Opperman
1976: Larry Clark
1977: Sammy Swindell
Mississippi Valley Auto Racing Association (Changed to Mississippi Valley Championship Circuit in 1953) - Illinois, Iowa, Missouri, Kansas
1946: Al Ketter
1947: Charlie Irons
1948: Rocky Williams
1949: Charlie Irons
1950: Rocky Williams
1951: Jerry Blundy
1952: Dick Nau
1953: Roy Blinstrup
1954: Vic Watson
1955: Vic Watson
1956: Rocky Williams
1957: Duke Hindahl
1958: Ken Rubright
1959: Rocky Williams
1960: Steve Orme
1961: Stoney Stoneking
1962: Stoney Stoneking
1963: Rocky Williams
1964: Pat O'Hara
National Championship Racing Association (supermodifieds) - Kansas, Oklahoma, Texas
1971: Emmett Hahn
1972: Harold Leep
1973: Harold Leep
1974: Frankie Lies
1975: Frankie Lies
1976: Harold Leep
1977: Emmett Hahn
1978: Ray Crawford
1979: Dave Frusher
1980: Jerry Stone
1981: Herb Copeland
There were many, many more. Anyone else want to take a shot?
later,
Bob Mays