[10] In 1932, Phi Iota Alpha reorganized and formed the Union Latino Americana (ULA) as its overall governing body, dividing their member fraternities in Latin America into zones according to the country they represented.

[11] Sigma Delta Alpha fraternity was established by twelve students and a professor on October 22, 1928, at the University of Puerto Rico at the Glorieta Fabián.

Every activity sponsored by the school administration was consulted with the Sigma Delta Alpha chapter president at the university in Río Piedras.

It was not an easy task since many of the Sigma Delta Alpha members did not want the change or to alter their history.

[8] The Puerto Rico zone rejected this decision because it considered the introduction of political issues to be detrimental to the fraternity.

Like the members of the Sigma, a majority of the members (including two undergraduates, Ramon Garcia and Antonio A. Verrissimo) of the Chapter of Phi Iota Alpha of the University of Louisiana disillusioned with the character given to their brotherhood, withdrew from the Fraternity and, in April 1939, founded Sigma Iota Alpha,[8][20][21] a fraternity composed of Latin students of that University.

Since Phi Sigma Alpha was organized in Puerto Rico with ideals similar to those of the Sigma Iota Alpha in Louisiana, and since both organizations were the product of almost identical former brotherhoods, negotiations were immediately started to merge the two brotherhoods into one.

[8] The Phi Sigma Alpha Zone was organized by a board of directors of the zone, the Militant chapter Alpha Boriquén of San Juan, and two university chapters, one at U.P.R.-Río Piedras and another one at the U.P.R.-Mayagüez (then known as the Colegio de Agricultura y Artes Mecanicas de Mayagüez (CAAM)).

While the baby boom effect declined dramatically in the late 1970s /early 1980s, it resurged at the end of the 1980s and continued until the beginning of the 1990s.

[8] "Un Sigma es ante todo un caballero" The 1990s brought an era of mandated accountability of fraternities, partly resulting from the deaths of two young cadets of the quasi-fraternal group the "Panthers" of the ROTC in the CAAM,[24] and also a damages lawsuit perpetrated against another island fraternity.

This brought forth a law, which can be found in Article 125 of the New Puerto Rico Penal Code, to control the initiation processes or "hazing" and to protect candidates.

[28] The clubhouse has two main activity halls and two smaller ones, which can all be opened up to create one big room, or used individually.

There is also a bar and restaurant area, called Vales’ Place, reserved for fraternity members and their guests.

On the back is the Pub Sigma, which is used by the Alfa Omega Activo chapter for their meetings and social events.

Through different fraternity activities, carried out to raise funds, the organization seeks to be fiscally responsible as the basis to fulfill its philanthropic goals.

[32][33] As part of their campaign against violence against women, the fraternity donated $80,000.00 to the feminist nonprofit Proyecto Matria in September 24, 2024.

The collegiate chapters are named by a Greek letter (depending on their order of founding), followed by the word "activo" (active).

[1] Dr Fernando L Villamil, world renowned Orthopedic Spine Surgeon, Latin Doctors TV show on Telemundo