Natives of the other states that constituted the Federal Republic of Central America who domicile in El Salvador may declare the desire to be Salvadoran without renouncing their nationality of origin (Article 90(3)).
Sources: El Salvador Constitution — nationality (Constitute Project)
Persons born in the territory of El Salvador are Salvadoran by birth under Article 90.
Sources: El Salvador Constitution — nationality (Constitute Project)
Children of a Salvadoran father or mother born abroad are Salvadoran by birth under Article 90.
Sources: El Salvador Constitution — nationality (Constitute Project)
Article 92: native Spaniards and Hispano-Americans may naturalize after one year of residence; other foreigners after five years; marriage to a Salvadoran has a two-year residence track. Grant is by competent authority under the law.
Sources: El Salvador Constitution — nationality (Constitute Project)