Title: Ohio State Buckeyes football
Content:  Ohio State joined the Big Ten in 1912; before that they were a member of the Ohio Athletic Conference and won two OAC titles. Ohio State has won a championship in the Big Ten 39 times, second-most in the conference and third most conference titles of any school in any conference. † Co-champions
Title: Ohio State Buckeyes football
Content:  This table reflects the results of Big Ten match-ups when both OSU and its opponent were members of the conference through November 9, 2019. Ohio State began Big Ten play in 1913. Examples of excluded results are Chicago after 1939, Michigan between 1907 and 1916, Michigan State before 1953, Penn State before 1993, and Nebraska before 2011 (see Big Ten History for further information). Ohio State's vacated wins from 2010 are not included (see 2010 Ohio State Buckeyes football team for further information).
Title: Ohio State Buckeyes football
Content:  When Penn State was added to the Big Ten conference football play in 1993, every member was given two designated rivals, teams to be played every year, with the other conference teams rotated out of the schedule at regular intervals. For geographic convenience, the Big Ten named Penn State as Ohio State's new designated rival in addition to Michigan. Ohio States leads the series 22–14 through the 2020 season.
Title: Michigan–Ohio State football rivalry
Content:  In Big Ten Conference play, Ohio State leads the series 51–47–4 through the 2021 meeting. Michigan was a charter member of the Big Ten in 1896 before leaving the league after the 1906 football season. Ohio State began league play with the 1913 season, and Michigan returned for the 1917 season. The 1918 matchup between the two schools was the first between them with both as Big Ten members. The 2020 matchup was canceled due to an increase in COVID-19 pandemic cases within the Michigan program.
Title: Ohio State University
Content:  In 1916, Ohio State was elected into membership in the Association of American Universities. The Ohio State University and the University of Michigan football programs participated in "The Ten Year War" between 1967 and 1978. In consistently close matches, it pitted coaches Woody Hayes of Ohio State and Bo Schembechler of Michigan against each other.
Title: Oberlin Yeomen football
Content:  During the early part of the 20th century, Oberlin enjoyed a wide range of success. They regularly competed with, and beat, teams like Michigan and Ohio State and rarely experienced a season with a losing record. Oberlin is a charter member of the NCAA and was one of the founding members of the Ohio Athletic Conference in 1902, along with Western Reserve University, Kenyon College, Ohio State University, Ohio Wesleyan University and Case School of Applied Science. The league commonly was known as the "Big Six." Ohio State left the league to join the Big Ten in 1913, signifying the widening athletic distance between liberal arts schools like Oberlin and major universities. Ohio State's all-time highest margin of victory was a 128–0 thrashing of Oberlin in 1916, however Oberlin is also the last in-state school to defeat Ohio State. The Yeomen upset the Buckeyes 7–6 at Ohio Field in Columbus in 1921.
Title: List of Ohio State Buckeyes football seasons
Content: The Big Ten Conference introduced divisional play in 2011; the divisional winners advance to the Big Ten Championship Game to determine the conference champion. ; The Associated Press began conducting a weekly college football poll in 1936. ; The college football coaches' poll has been sponsored by multiple organizations since its creation in 1950. Its current sponsor is USA Today. ; Overtime rules in college football were introduced in 1996, making ties impossible. ; Ohio State vacated all 12 of its victories and its Big Ten Conference championship from the 2010 season. ; Ohio State finished with a share of the Big Ten championship in 2010, which was unaffected by the vacation of the school's victories from that season. ; Luke Fickell was named as the interim head coach of the Ohio State Buckeyes in 2011, following Jim Tressel's dismissal on May 30, 2011. 
Title: Ohio State Buckeyes men's basketball
Content:  Ohio State has won 4 Big Ten Tournament championships since its inception during the 1997–98 season. Ohio State won their first title in 2002 under Jim O'Brien (later vacated), while winning 4 under head coach Thad Matta. Under Matta, the Buckeyes appeared in the Big Ten Tournament championship five consecutive seasons from 2009 to 2013.
Title: 2013 Ohio State Buckeyes football team
Content:  season with a record of 12 wins and 2 losses (12–2 overall, 8–0 in the Big Ten), following losses to Michigan State in the Big Ten Championship Game and to Clemson in the Orange Bowl. After an undefeated season in 2012, Ohio State signed a highly ranked recruiting class and entered the 2013 season ranked No. 2 in all major college football polls, as well as being considered the favorite to win the Leaders Division, while also competing for the Big Ten championship and national championship. Ohio State opened the season defeating all of their non-conference opponents by a combined score of 
Title: 2020 Ohio State Buckeyes football team
Content:  The No. 5 Ohio State Buckeyes defeated the Nebraska Cornhuskers 52–17, in what was both programs' season debut. Both programs were reportedly behind the movement to reinstate Big Ten Football in the Fall. The game was featured on Fox College Football's Big Noon Kickoff, with the hosts on location. The Ohio State Buckeyes were 27.5-point favorites.

Question: when did ohio state join the big 10?
Answer: 1912.