It was founded in America in Los Angeles by an illegal immigrant named Ernesto Miranda. It was later exported to El Salvador where the majority of the members are currently. That is why it is easy to deport MS-13 members because so many of them are here illegally and most left tards won't publicly defend them if they are up for deportation. It is an easy target for Trump with little public resistance which is why he harps on it.
Maybe we need to strengthen our borders before you allow anymore "American" gangs to form via illegal immigration.
They were asked to assimilate so they did