However, upon the completion of the mission The Green Sabre, the Aztecas lose all of their territory and influence to the Vagos - including El Corona, Unity Station, and Little Mexico. CRASH reveals this mentality to CJ during the mission Gray Imports by stating "if one tribe gets an unfair advantage over another, that truly troubles me Carl!". Another possibility for this is because CRASH does not want to make the VLA too powerful over the other gangs by equipping them with even more weapons (due to them already being heavily armed). Either CRASH are scared of the Aztecas due to them being possibly the most heavily armed gang in Los Santos, or they avoid them because they mistakenly think they are weak due to their small size. This is odd since the Aztecas are heavily involved in arms dealing/gun running. This is because the Aztecas never show-up to rob the weapons train during the mission Catalyst, where as the other three gangs were tipped off by CRASH about the train. It is likely that the Aztecas have no involvement with C.R.A.S.H. From this point on, Cesar and CJ start to develop a close friendship though the gang violence between the Aztecas and Grove Street Families doesn't decrease. Fortunately, Cesar is able to influence Jose to "cool down", thus causing him to leave and possibly saving CJ's life. CJ makes his objection to the relationship clear, and an influential (possibly an OG) Azteca member called Jose approaches CJ and confronts/insults him for his rudeness. CJ wins the competition without any violence taking place and is then introduced to Cesar Vialpando - Kendl's boyfriend. Fortunately, the Aztecas do not harass or fight CJ and let him take part in the bouncing competition against an Azteca member.
Sweet orders CJ to follow his sister to a lowriding club at Unity Station, where a lowriding competition with a high concentration of Azteca gang members is taking place - including Cesar Vialpando himself. They are first seen during the mission Cesar Vialpando. Because of this, the gang acts as a fulcrum point between the relationship of Sweet and his sister due to Cesar being Kendl's boyfriend - much to the dismay of Sweet because to Cesar's involvement with the VLA. The Varrios Los Aztecas are not a major part of the story, but are first mentioned during Sweet & Kendl in which Sweet refers to Kendl's relationship with a high-ranking Azteca member - Cesar Vialpando, stating "you know we beefing". It is highly likely that they evolved from the El Corona neighborhood, and their presence grew with the increase of Mexican and other Hispanic/Latino immigration to the area, correlating with the relative deprivation of the area compared to the rest of the city.
Likewise, the origins and past of their rivalry with the other Los Santos gangs - particularly the Los Santos Vagos - is also unknown, though it obviously began sometime between 19. Much of their origins and past history is unknown. The Varrios Los Aztecas have been around since the early 1980s, and are one of the more recently formed gangs in Los Santos.