Chronological timeline • 1991 – On November 4, 1991, the CSAC was founded as the Pennsylvania Athletic Conference (PAC). Charter members included
Alvernia College,
Beaver College (now Arcadia University),
Cabrini College (now Cabrini University),
Cedar Crest College,
Eastern University,
Gwynedd-Mercy College (now Gwynedd Mercy University),
Immaculata University,
Marywood University,
College Misericordia (now Misericordia University), and
Rosemont College, beginning the 1992–93 academic year. • 1992 –
Neumann College (now Neumann University) joined the PAC alongside the other 10 charter members in September 1992. • 1993 – On April 28, 1993, the PAC was granted affiliate membership within the
National Collegiate Athletic Association (NCAA) in the 1993–94 academic year. • 1993 –
Allentown College (now DeSales University) joined the PAC in the 1993–94 academic year. • 1995 – The PAC had achieved full membership within the NCAA Division III ranks in the 1995–96 academic year. • 1997 – DeSales left the PAC to join the
Middle Atlantic Conferences after the 1996–97 academic year. • 1997 –
Wesley College joined the PAC in the 1997–98 academic year. • 2001 –
Shenandoah University and
Villa Julie College (now Stevenson University) joined the PAC as associate members for men's lacrosse in the 2002 spring season (2001–02 academic year). • 2006 – Stevenson left the PAC as an associate member for men's lacrosse after the 2006 spring season (2005–06 academic year). • 2007 – Arcadia and Wesley (Del.) left the PAC to join the
Middle Atlantic Conferences after the 2006–07 academic year. • 2007 –
Centenary College of New Jersey (now Centenary University) and the
College of Notre Dame of Maryland (now Notre Dame of Maryland University) joined the PAC in the 2007–08 academic year. • 2008 – Alvernia, Eastern (Pa.), and Misericordia left the PAC to join the Middle Atlantic Conferences after the 2007–08 academic year. • 2008 – The PAC was re-branded as the Colonial States Athletic Conference (CSAC), beginning the 2008–09 academic year. • 2008 –
Baptist Bible College (now Clarks Summit University),
Keystone College and
Philadelphia Biblical University (now Cairn University) joined the CSAC in the 2008–09 academic year. • 2012 – Shenandoah left the CSAC as an associate member for men's lacrosse after the 2012 spring season (2011–12 academic year). • 2015 –
Franciscan University of Steubenville and
Pennsylvania State University at Erie, The Behrend College joined the CSAC as associate members for men's and women's indoor and outdoor track & field in the 2016 spring season (2015–16 academic year). • 2018 – Cabrini, Gwynedd Mercy, Immaculata, Marywood, and Neumann left the CSAC to join the newly-formed
Atlantic East Conference (AEC) after the 2017–18 academic year. • 2018 –
Bryn Athyn College and
Wilson College joined the CSAC in the 2018–19 academic year. • 2018 –
Alfred State College joined the CSAC as an associate member for men's and women's indoor and outdoor track & field in the 2019 spring season (2018–19 academic year). • 2018 –
Kean University,
Montclair State University, and
Stockton University joined the CSAC as associate members for men's lacrosse in the 2019 spring season (2018–19 academic year). • 2018 – The
University of Valley Forge joined the CSAC as an associate member for baseball in the 2019 spring season (2018–19 academic year). • 2019 • Franciscan left the CSAC as an associate member for men's and women's indoor and outdoor track & field after the 2019 spring season (2018–19 academic year). • The
College of Saint Elizabeth (now Saint Elizabeth University) joined the CSAC in the 2019–20 academic year. •
Lancaster Bible College joined the CSAC as an associate member for field hockey in the 2019 fall season (2019–20 academic year). • 2020 • Valley Forge would later upgrade to join the CSAC for all sports in the 2020–21 academic year. •
Gallaudet University joined the CSAC as an associate member for men's and women's indoor and outdoor track & field in the 2021 spring season (2020–21 academic year). • 2021 • Centenary (N.J.) left the CSAC to join Atlantic East Conference after the 2020–21 academic year; although its field hockey and women's lacrosse teams would remain in the CSAC as associate members until the 2022 spring season (2021–22 academic year). •
Pratt Institute joined the CSAC as an associate member for men's volleyball in the 2022 spring season (2021–22 academic year). • 2022 • The CSAC and the
United East Conference announced their intent to merge, beginning in the fall 2023 season. • Lancaster Bible added men's volleyball to its CSAC membership in the 2023 spring season (2022–23 academic year). • 2023 • Notre Dame of Maryland would add men's sports for the 2023–24 academic year. • The CSAC and United East officially announced that the merged conference would retain the United East name, officially ending the CSAC on July 1, 2023. ==Member schools==