Atlantic Sun Conference

The Atlantic Sun Conference (ASUN) is a collegiate athletic conference operating mostly in the Southeastern United States, competing at the NCAA Division I level. Originally established as the Trans America Athletic Conference (TAAC) in 1978, it was renamed as the Atlantic Sun Conference in 2001, and briefly rebranded as the ASUN Conference from 2016 to 2023. The conference still uses "ASUN" as an official abbreviation. The conference headquarters are located in Jacksonville.

The conference was first formed on September 19, 1978, as the Trans America Athletic Conference, at the Dallas–Fort Worth Regional Airport Marina Hotel. Its charter members were Oklahoma City University, Pan American University (later renamed University of Texas-Pan American), Northeast Louisiana University (now known as the University of Louisiana at Monroe), Houston Baptist University (now Houston Christian University), Hardin-Simmons University, Centenary College of Louisiana, Samford University, and Mercer University, all of whom were previously D-I independents. None of the eight charter members remain in the conference today.

Almost immediately after its formation, the conference experienced a shake-up in its membership. Oklahoma City departed to become a charter member of the Midwestern City Conference (known today as the Horizon League), while UTPA returned to D-I independent status—both had only played a single season in the infant league. The TAAC was quick to replace the outgoing members with Northwestern State University and the University of Arkansas at Little Rock, along with Georgia Southern University in 1980, but this instability would prove to be a trend through the coming years—over the next 20 years, the conference would accept 16 new members, with many of these leaving after only playing a handful of seasons. 1982 saw the departure of another charter member, Northeast Louisiana, to the Southland Conference. Additionally, it saw the arrival of Nicholls State University, who originally planned to join the TAAC as a full member. However, due to an oversight by the NCAA, adding in a new program who had not competed in Division I for at least five years would result in the offending conference forfeiting their automatic bid to the NCAA Division I men's basketball tournament. To get around this, the TAAC announced that Nicholls State would compete as a provisional member, ineligible for the men's basketball tournament until it completed its D-I transition in 1985. However, it, along with Northwestern State, left the conference in 1984 to join the Gulf Star Conference instead.

The remainder of the 1980s saw mostly growth for the conference, adding Georgia State University in 1983, Stetson University in 1985, and the University of Texas at San Antonio in 1986. However, near the end of the decade, the conference was hit with 5 departures over 4 consecutive years, beginning with Houston Baptist transitioning to the NAIA in 1989. This was followed by Hardin-Simmons dropping to NCAA Division III in 1990, UTSA and Arkansas–Little Rock leaving for the Southland and Sun Belt conferences in 1991, respectively, and Georgia Southern leaving for the Southern Conference in 1992. In the midst of this, the conference began to relentlessly pursue expansion throughout the 1990s to offset these losses, adding Florida International University in 1990, Southeastern Louisiana University and the College of Charleston in 1991, the University of Central Florida in 1992, Florida Atlantic University in 1993, Campbell University in 1994, Jacksonville State University in 1995, Troy State University in 1997, and Jacksonville University in 1998. Of these 9 schools, though, only 2 ended up staying with the conference for longer than 15 years.

The turn of the millennium saw another charter member in Centenary depart in 1999 for the Mid-Continent Conference (now the Summit League); the league was able to offset this with the addition of Belmont University in 2001. Around this same time, the conference sought to rebrand itself, changing its name from the Trans America Athletic Conference to the Atlantic Sun Conference. The newly rebranded A-Sun continued to expand into the 2000s, adding Gardner–Webb University in 2002, Lipscomb University in 2003, East Tennessee State University, Kennesaw State University, and the University of North Florida in 2005, and Florida Gulf Coast University & the University of South Carolina Upstate in 2007. It also lost its fair share of members as well—largely some of the aforementioned members that had been added during the '90s, such as FIU, Florida Atlantic, and Troy to the Sun Belt, Georgia State to the Colonial Athletic Association, and UCF to Conference USA, but it also saw the departure of Samford to the Ohio Valley Conference, leaving Mercer as the only remaining charter member.

The start of the 2010s gave the A-Sun a bit of a reprieve from conference realignment, losing only Campbell and Belmont in 2011 and 2012 to the Big South and OVC, respectively, and only adding recent D-I upgrader Northern Kentucky University in 2012. 2014 saw the departure of its final charter member, Mercer, to the Southern Conference in 2014; however, the Bears continued to compete in the ASUN as an affiliate for beach volleyball and added men's lacrosse to its ASUN membership in 2022. The ASUN continued to expand and contract slowly through the mid-2010s, losing only Northern Kentucky and East Tennessee State (along with Mercer), and only adding the New Jersey Institute of Technology in 2015.

This slow pace didn't stay for long, however. The second half of the decade saw the conference rebranding a second time, to simply the ASUN Conference Two years later, the University of North Alabama arrived from the Division II Gulf South Conference, and Liberty University left the Big South for the ASUN. More recently, Bellarmine University joined from the Division II Great Lakes Valley Conference and NJIT left for the America East Conference in 2020–21. On July 1, 2024, the University of West Georgia joined from the Division II Gulf South Conference.

On January 22, 2020, it was announced that the Coastal Collegiate Sports Association and the ASUN would merge to create a new Division I multisport conference. The timeline below was released with the announcement of this merger and expansion plan: