Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Colloquial language ; Bable; Asturian ; Madrileño; Castilian ; Chicano; Puertoricans; USA (span. Sprache in den) ; Mexican American Spanish; USA (Spanish language in the) ; Spanglish; Inglañol; Tex-Mex; Spanish in the USA