Louisiana - Monroe is headed to the Div 1-A Sun-Belt Conference for All-Sports.
La-Monroe already was a football member of the conference (but kind of provisional, at that) .
The all-sports invitation was announced almost a year ago.
Here's what happened. The WAC lost it's Texas component to C-USA, and re-stocked with the western Sun-Belt schools (NM State, Utah State, and Idaho).
The Sun-Belt looked at it's alignment, and figured that Denver was rather isolated, and would be looking to depart whenever an invitation from a western conference arrived. So the Sun-Belt decided to re-stock with Southeastern schools that play football. This meant shopping for 1-AA to 1-A upgrades. Troy (Alabama) was already in the works, FAU and FIU were added next. So if you subtract Denver, they had 11 members (7 played football), plus a FB only member in La-Monroe.
The Sun-Belt wanted to add a #12 that played football.
The WAC's realignment left Louisiana Tech stranded as the only school east of Las Cruces, NM, and they desperately wanted to be CUSA's replacement for TCU. UTEP got the invite, so the Sun-Belt invited La Tech to be Sun-Belt #12. Some time earlier, La Tech had left the Sun-Belt for the greener grass of the (then 16-team) WAC, so they felt returning would have been a "step down" and I suppose humiliating, even though geographically it would make a lot of sense.
Apparently, La Tech's strategy is to be positioned to join CUSA, if and when they lose teams again (perhaps if the Big East splits, and the BE FB 8 expand by adding Memphis and/or Marshall and/or ECU and/or UCF).
So the Sun Belt, spurned by La Tech, said "OK, LA-Monroe, you wanna join us for all-sports ?" They accepted, and announced their departure from the Southland.