If you want to be technical, the French the coalition in 1921 and pulled out in 1936, and rejoined in 1953.
Learn your history:
http://www.soconsports.com/ViewArticle.d...LID=177772
Membership history
On Feb. 25, 1921, representatives from 14 of the Southern Intercollegiate Athletic Association’s (SIAA) 30 members met at Atlanta’s Piedmont Hotel to establish the Southern Intercollegiate Conference. On hand at the inaugural meeting were officials from Alabama, Alabama Polytechnic Institute (Auburn), Clemson, Georgia, Georgia School of Technology (Georgia Tech), Kentucky, Maryland, Mississippi A&M (Mississippi State), North Carolina, North Carolina State, Tennessee, Virginia, Virginia Polytechnic Institute (Virginia Tech) and Washington & Lee.
Dr. S.V. Sanford of Georgia was chosen as acting chairman and N.W. Dougherty of Tennessee was named secretary. The decision to form a new athletic conference was motivated by the desire to have a workable number of conference games for each league member. With 30 schools in the SIAA by the early 1920s, it was impossible to play every school at least once during the regular season and many schools went several years between playing some conference members. In addition, in 1920, the SIAA voted down proposed rules that an athlete must be in a college a year before playing on its teams and refused to abolish a rule permitting athletes to play summer baseball for money.
Play began in the fall of 1921, and a year later, six more schools joined the fledgling league, including Tulane (which had attended the inaugural meeting but had elected not to join), Florida, Louisiana (LSU), Mississippi, South Carolina and Vanderbilt. VMI joined in 1923 and Duke was added in 1929.
By the 1930s, membership in the Southern Conference had reached 23 schools. C.P. “Sally” Miles of Virginia Tech, president of the Southern Conference, called the annual league meeting to order on Dec. 9, 1932, at the Farragut Hotel in Knoxville, Tennessee. There, it announced that 13 institutions west and south of the Appalachian Mountains were reorganizing as the Southeastern Conference. Members of the new league included Alabama, Alabama Polytechnic Institute, Florida, Georgia, Georgia School of Technology, Kentucky, Louisiana, Mississippi, Mississippi A&M, University of the South, Tennessee, Tulane and Vanderbilt.
According to the minutes of the meeting, Georgia’s Dr. Sanford stated that the division was made along geographical lines. Florida’s Dr. J.J. Tigert, acting as spokesman for the withdrawing group, regretted the move but believed it was necessary as the Southern Conference had grown too large. The resignations were accepted and the withdrawing schools formed the new league, which began play in 1933.
The Southern Conference continued with membership of 10 institutions, including Clemson, Duke, Maryland, North Carolina, North Carolina State, South Carolina, Virginia, VMI, Virginia Tech and Washington & Lee.
The second major shift occurred some 20 years later. By 1952, the Southern Conference included 17 colleges and universities. Another split occurred when seven schools – Clemson, Duke, Maryland, North Carolina, North Carolina State, South Carolina and Wake Forest – departed to form the Atlantic Coast Conference, which began play in 1953.
Before the Southern Conference the SAIAA contained NC A&M (NC State), MD, VPI&SU (VT), UVa, Washington and Lee, William and Mary, Georgetown, UNC, Trinity (Duke), etc., etc. Clemson, GT, SC, and many of the future SEC were in the SIAA.
https://cfbdatawarehouse.com/data/confer...?conid=171
What you will notice is that a subtle cultural, and geographic divide has existed for nearly 120 with the line shifting along I-85 between Atlanta and Charlotte.
I think you can use college football as a cultural metaphor in that football is a form of modified warfare with the battle being for honor and glory. If you played or rooted for team "A" you were with King Henry on St. Crispian's Day.
It's not a coincidence that this culture is what ESPN has sought to own and add to it those cultures with enough similarity to coexist inside a hotel meeting room.