Alum-Ni
2021 Co-PotY
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@PSUTE you've been waiting a long time for this 
This is a project I started quite a while ago, tracking the changes in football conference membership, of which there have been changes almost every year. I began in 1936 as that was the first year of the AP Poll and what some consider the beginning of the modern-era of CFB. There are likely some errors here and there with teams being off a year plus-or-minus, but overall a fairly accurate depiction of changes made from 1936 through 2020.
1936
Conferences looked like this in 1936:
Big 6 Conference (6 teams)
Iowa State, Kansas, Kansas State, Missouri, Nebraska, Oklahoma
Border Conference (7 teams)
Arizona, Arizona State, Northern Arizona, New Mexico, New Mexico State, Texas-El Paso, Texas Tech
Independents (43 teams)
Army, Brown, Bucknell, Carnegie Tech, Centenary, Colgate, Columbia, Cornell, Dartmouth, Detroit Mercy, Duquesne, Erskine, Fordham, George Washington, Georgetown, Gonzaga, Harvard, Holy Cross, Loyola Marymount, Loyola-New Orleans, Manhattan, Marquette, Mercer, Miami (FL), Michigan State, Navy, New York University, Notre Dame, Pennsylvania, Penn State, Pittsburgh, Presbyterian, Princeton, San Francisco, Santa Clara, St. Louis, St. Mary's, Syracuse, Temple, Villanova, West Virginia, Wofford, Yale
Missouri Valley Conference (7 teams)
Creighton, Drake, Grinnell, Oklahoma State, Tulsa, Washburn, Washington (MO)
Pacific Coast Conference (10 teams)
California, Idaho, Montana, Oregon, Oregon State, Stanford, UCLA, USC, Washington, Washington State
Rocky Mountain Athletic Conference (12 teams)
Brigham Young, Colorado, Colorado College, Colorado School of Mines, Colorado State, Denver, Montana State, Northern Colorado, Utah, Utah State, Western State, Wyoming
Southeastern Conference (13 teams)
Alabama, Auburn, Florida, Georgia, Georgia Tech, Kentucky, LSU, Mississippi, Mississippi State, Sewanee, Tennessee, Tulane, Vanderbilt
Southern Conference (16 teams)
Citadel, Clemson, Davidson, Duke, Furman, Maryland, North Carolina, North Carolina State, Richmond, South Carolina, Virginia, Virginia Military Institute, Virginia Tech, Wake Forest, Washington & Lee, William & Mary
Southwest Conference (7 teams)
Arkansas, Baylor, Rice, Southern Methodist, Texas, Texas A&M, Texas Christian
Western Conference (10 teams)
Chicago, Illinois, Indiana, Iowa, Michigan, Minnesota, Northwestern, Ohio State, Purdue, Wisconsin
- There are 131 members of Division I football at this time.
=========================================================
1937
- Erskine, Loyola-New Orleans, Mercer, Presbyterian, St. Louis, and Wofford leaves Independents. Outside of St. Louis the remaining schools quit playing a heavy schedule of Division I football.
- Boston College joins Independents and begins playing a schedule featuring mostly Division I opponents, there are now 38 Independents
- Grinnell leaves the Missouri Valley Conference and is replaced by St. Louis, keeping membership at seven teams. Grinnell drops down to a lower level of competition.
- There are now a total of 126 members of Division I football at this time
=========================================================
1938
- Virginia leaves the Southern Conference to play as an independent. Also Hampden-Sydney joins up as an independent giving that group 40 members. The Southern Conference is left with 15 members.
- The seven major schools in the Rocky Mountain Athletic Conference withdrew to form their own league. Brigham Young, Colorado, Colorado State, Denver, Utah, Utah State and Wyoming formed the Mountain States Conference. The Mountain States Conference was often referred to as the Big Seven Conference for the next eight years. Colorado College, Colorado School of Mines, Montana State, Northern Colorado and Western State remained in the RMAC and now played at a lower level of college football.
- At this time there are 121 members of major Division I football.
=========================================================
1939
- Two more schools join the Independents: Southwestern (Texas) and Hardin-Simmons, giving that group 42 members.
- Division I membership is now at 123 members.
=========================================================
1940
- Sewanee leaves the SEC to become an Independent, dropping membership there to 12 teams.
- The University of Chicago leaves the Western Conference, dropping their membership to nine teams.
- There are now 41 Independent teams. Besides the addition of Sewanee, Bucknell and Southwestern (TX) drop out of Division I.
- This leaves a total of 120 teams in Division I.
=========================================================
1941
- Hardin-Simmons joins the Border Conference, from the Independents, while West Texas A&M joins the league, moving up to Division I. The Border Conference now has nine members.
- George Washington leaves the Independents to join the Southern Conference giving that league 16 members.
- Hampden-Sydney and Carnegie Tech drops out of Division I football and leaves the Independents. New York University joins as an Independent. There are now 38 Independents.
- Washburn drops out of Division I football by leaving the Missouri Valley Conference, the MVC now has six members.
- There are now 119 Division I football members.
=========================================================
1942
- The following teams join the Independent ranks: Georgia Pre-Flight, North Carolina Pre-Flight, Jacksonville NAS, Great Lakes Navy, Iowa Pre-Flight, St. Mary's Pre-Flight. Independents Gonzaga, Centenary, New York University and Sewanee drop out of Division I football. There are now 38 Independents.
- Washington University of Missouri of the Missouri Valley Conference drops out of Division I.
- There are now 118 Division I football members.
=========================================================
1943
- Due to World War II, the following schools did not field football teams this year. A school with a year in parentheses shows the year the school brought football back, no year means the school resumed in 1944: Alabama, Auburn, Baylor (1945), Boston College, Citadel (1946), Davidson (1946), Detroit Mercy (1945), Drake (played a non-Division I schedule in 1943), Duquesne (1947), Florida, Fordham (1946), Furman (1946), Georgetown (1946), George Washington (1946), Harvard (1945), Idaho (1945), Kentucky, Loyola Marymount (1949), Miami (FL), Michigan State, Mississippi, Mississippi State, Montana (1946), Oregon (1945), Oregon State (1945), Santa Clara (1946), St. Louis (1945), Stanford (1946), Syracuse, Tennessee, Vanderbilt (1945), Virginia Tech (1945), Washington (played non-Division I schedule in 1944), Washington State (1945), Washington & Lee (1946) and William & Mary did not field teams this year due to World War II.
- The entire Border Conference and Mountain States Conference did not compete due to World War II.
- Creighton University and Manhattan College discontinued football entirely.
- Colorado College, March Field, Del Monte Pre-Flight, Pacific, Fort Riley, Alameda Coast Guard, Texas Tech, Camp Grant join the Independents. Jacksonville NAS quits football. There are 34 Independents for this year.
- Due to World War II, only 73 schools fielded teams in 1943
=========================================================
1944
- There are 39 Independents this year. Joining as new Independents are Amarillo Field, Norman NAS, Randolph Field, Bucknell (rejoins Division I), Second Air Force (CO), Coast Guard, Lubbock Field, Fort Warren, Idaho State, New York University and Presbyterian. Dropping out were Del Monte Flight, Georgia Pre-Flight, Pacific (dropped until 1950), Fort Riley, North Carolina Pre-Flight, Camp Grant, St. Mary's (rejoined in 1945), Princeton (rejoined in 1945), and San Francisco (rejoined in 1946)
- Texas Tech leaves the Independents and rejoins the Border Conference which has three members at this time: Texas Tech, West Texas A&M and New Mexico.
- The Missouri Valley Conference suspends play in 1944 due to World War II.
- The Mountain States Conference resumes play with four teams: Colorado, Denver, Utah and Utah State
- There are 91 schools competing in Division I football this year
=========================================================
1945
- There are 35 Independents playing this season. Nearly all of the military teams (Pre-Flight schools, forts, etc.) quit playing football this season. Lafayette and Tennessee-Chattanooga are new Independents.
- Most of the members of the Pacific Coast Conference resume playing football: USC, Washington, Washington State, Oregon, Oregon State, UCLA, California, and Idaho.
- The Missouri Valley Conference resumes football with five members: Drake, Oklahoma State, St. Louis, Tulsa and Wichita State
- Colorado State resumes football and rejoins the Mountain States Conference as the fifth member
- Vanderbilt resumes football and brings the SEC back to 12 teams
- There are 101 Division I football teams this year.
This is a project I started quite a while ago, tracking the changes in football conference membership, of which there have been changes almost every year. I began in 1936 as that was the first year of the AP Poll and what some consider the beginning of the modern-era of CFB. There are likely some errors here and there with teams being off a year plus-or-minus, but overall a fairly accurate depiction of changes made from 1936 through 2020.
1936
Conferences looked like this in 1936:
Big 6 Conference (6 teams)
Iowa State, Kansas, Kansas State, Missouri, Nebraska, Oklahoma
Border Conference (7 teams)
Arizona, Arizona State, Northern Arizona, New Mexico, New Mexico State, Texas-El Paso, Texas Tech
Independents (43 teams)
Army, Brown, Bucknell, Carnegie Tech, Centenary, Colgate, Columbia, Cornell, Dartmouth, Detroit Mercy, Duquesne, Erskine, Fordham, George Washington, Georgetown, Gonzaga, Harvard, Holy Cross, Loyola Marymount, Loyola-New Orleans, Manhattan, Marquette, Mercer, Miami (FL), Michigan State, Navy, New York University, Notre Dame, Pennsylvania, Penn State, Pittsburgh, Presbyterian, Princeton, San Francisco, Santa Clara, St. Louis, St. Mary's, Syracuse, Temple, Villanova, West Virginia, Wofford, Yale
Missouri Valley Conference (7 teams)
Creighton, Drake, Grinnell, Oklahoma State, Tulsa, Washburn, Washington (MO)
Pacific Coast Conference (10 teams)
California, Idaho, Montana, Oregon, Oregon State, Stanford, UCLA, USC, Washington, Washington State
Rocky Mountain Athletic Conference (12 teams)
Brigham Young, Colorado, Colorado College, Colorado School of Mines, Colorado State, Denver, Montana State, Northern Colorado, Utah, Utah State, Western State, Wyoming
Southeastern Conference (13 teams)
Alabama, Auburn, Florida, Georgia, Georgia Tech, Kentucky, LSU, Mississippi, Mississippi State, Sewanee, Tennessee, Tulane, Vanderbilt
Southern Conference (16 teams)
Citadel, Clemson, Davidson, Duke, Furman, Maryland, North Carolina, North Carolina State, Richmond, South Carolina, Virginia, Virginia Military Institute, Virginia Tech, Wake Forest, Washington & Lee, William & Mary
Southwest Conference (7 teams)
Arkansas, Baylor, Rice, Southern Methodist, Texas, Texas A&M, Texas Christian
Western Conference (10 teams)
Chicago, Illinois, Indiana, Iowa, Michigan, Minnesota, Northwestern, Ohio State, Purdue, Wisconsin
- There are 131 members of Division I football at this time.
=========================================================
1937
- Erskine, Loyola-New Orleans, Mercer, Presbyterian, St. Louis, and Wofford leaves Independents. Outside of St. Louis the remaining schools quit playing a heavy schedule of Division I football.
- Boston College joins Independents and begins playing a schedule featuring mostly Division I opponents, there are now 38 Independents
- Grinnell leaves the Missouri Valley Conference and is replaced by St. Louis, keeping membership at seven teams. Grinnell drops down to a lower level of competition.
- There are now a total of 126 members of Division I football at this time
=========================================================
1938
- Virginia leaves the Southern Conference to play as an independent. Also Hampden-Sydney joins up as an independent giving that group 40 members. The Southern Conference is left with 15 members.
- The seven major schools in the Rocky Mountain Athletic Conference withdrew to form their own league. Brigham Young, Colorado, Colorado State, Denver, Utah, Utah State and Wyoming formed the Mountain States Conference. The Mountain States Conference was often referred to as the Big Seven Conference for the next eight years. Colorado College, Colorado School of Mines, Montana State, Northern Colorado and Western State remained in the RMAC and now played at a lower level of college football.
- At this time there are 121 members of major Division I football.
=========================================================
1939
- Two more schools join the Independents: Southwestern (Texas) and Hardin-Simmons, giving that group 42 members.
- Division I membership is now at 123 members.
=========================================================
1940
- Sewanee leaves the SEC to become an Independent, dropping membership there to 12 teams.
- The University of Chicago leaves the Western Conference, dropping their membership to nine teams.
- There are now 41 Independent teams. Besides the addition of Sewanee, Bucknell and Southwestern (TX) drop out of Division I.
- This leaves a total of 120 teams in Division I.
=========================================================
1941
- Hardin-Simmons joins the Border Conference, from the Independents, while West Texas A&M joins the league, moving up to Division I. The Border Conference now has nine members.
- George Washington leaves the Independents to join the Southern Conference giving that league 16 members.
- Hampden-Sydney and Carnegie Tech drops out of Division I football and leaves the Independents. New York University joins as an Independent. There are now 38 Independents.
- Washburn drops out of Division I football by leaving the Missouri Valley Conference, the MVC now has six members.
- There are now 119 Division I football members.
=========================================================
1942
- The following teams join the Independent ranks: Georgia Pre-Flight, North Carolina Pre-Flight, Jacksonville NAS, Great Lakes Navy, Iowa Pre-Flight, St. Mary's Pre-Flight. Independents Gonzaga, Centenary, New York University and Sewanee drop out of Division I football. There are now 38 Independents.
- Washington University of Missouri of the Missouri Valley Conference drops out of Division I.
- There are now 118 Division I football members.
=========================================================
1943
- Due to World War II, the following schools did not field football teams this year. A school with a year in parentheses shows the year the school brought football back, no year means the school resumed in 1944: Alabama, Auburn, Baylor (1945), Boston College, Citadel (1946), Davidson (1946), Detroit Mercy (1945), Drake (played a non-Division I schedule in 1943), Duquesne (1947), Florida, Fordham (1946), Furman (1946), Georgetown (1946), George Washington (1946), Harvard (1945), Idaho (1945), Kentucky, Loyola Marymount (1949), Miami (FL), Michigan State, Mississippi, Mississippi State, Montana (1946), Oregon (1945), Oregon State (1945), Santa Clara (1946), St. Louis (1945), Stanford (1946), Syracuse, Tennessee, Vanderbilt (1945), Virginia Tech (1945), Washington (played non-Division I schedule in 1944), Washington State (1945), Washington & Lee (1946) and William & Mary did not field teams this year due to World War II.
- The entire Border Conference and Mountain States Conference did not compete due to World War II.
- Creighton University and Manhattan College discontinued football entirely.
- Colorado College, March Field, Del Monte Pre-Flight, Pacific, Fort Riley, Alameda Coast Guard, Texas Tech, Camp Grant join the Independents. Jacksonville NAS quits football. There are 34 Independents for this year.
- Due to World War II, only 73 schools fielded teams in 1943
=========================================================
1944
- There are 39 Independents this year. Joining as new Independents are Amarillo Field, Norman NAS, Randolph Field, Bucknell (rejoins Division I), Second Air Force (CO), Coast Guard, Lubbock Field, Fort Warren, Idaho State, New York University and Presbyterian. Dropping out were Del Monte Flight, Georgia Pre-Flight, Pacific (dropped until 1950), Fort Riley, North Carolina Pre-Flight, Camp Grant, St. Mary's (rejoined in 1945), Princeton (rejoined in 1945), and San Francisco (rejoined in 1946)
- Texas Tech leaves the Independents and rejoins the Border Conference which has three members at this time: Texas Tech, West Texas A&M and New Mexico.
- The Missouri Valley Conference suspends play in 1944 due to World War II.
- The Mountain States Conference resumes play with four teams: Colorado, Denver, Utah and Utah State
- There are 91 schools competing in Division I football this year
=========================================================
1945
- There are 35 Independents playing this season. Nearly all of the military teams (Pre-Flight schools, forts, etc.) quit playing football this season. Lafayette and Tennessee-Chattanooga are new Independents.
- Most of the members of the Pacific Coast Conference resume playing football: USC, Washington, Washington State, Oregon, Oregon State, UCLA, California, and Idaho.
- The Missouri Valley Conference resumes football with five members: Drake, Oklahoma State, St. Louis, Tulsa and Wichita State
- Colorado State resumes football and rejoins the Mountain States Conference as the fifth member
- Vanderbilt resumes football and brings the SEC back to 12 teams
- There are 101 Division I football teams this year.