The good old days when there were only 3 different classifications in Georgia HS athletics. When I grew up in Huntsville, AL there were only 4 in Alabama. Now we have 7 here in Georgia and I think they have 6 in Alabama now. Needless to say they are now giving out several more trophies.
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From 1947-1955, there were 4 in GA: AA, A, B & C
From 1956-1972, there were 5 in GA: AAA, AA, A, B & C
From 1973-1977, there were 4 in GA: AAA, AA, A, & B
From 1978-1999, there were 4 in GA: AAAA, AAA, AA, & A
From 2000-2011, there were 5 in GA: AAAAA, AAAA, AAA, AA, & A
From 2012-2015, there were 7 in GA: AAAAAA, AAAAA, AAAA, AAA, AA, & A-Public & A-Private
Since 2016, there have been 8 in GA: AAAAAAA, AAAAAA, AAAAA, AAAA, AAA, AA, & A-Public & A-Private
There was a lot of noise back in the 1970s to get rid of the B & C classes as it supposedly implied an inferior level of play. Tell that to Brent Cunningham who came out of 1967 C Champ Putnam County. Most of the impact of A-Private is having a class for a lot of small, non-football schools.
Toss in the melding of the racially divided systems about 1965 or so, a rapidly growing population in the 1970s & 1980s and you suddenly have a lot more schools & some unwieldy matchups & impossible transportation & logistics issues. Ergo, more classifications.