The article investigates the historical background, sociolinguistic factors, and structural-linguistic consequences of the formation of the Spanish language in Latin America. It examines the process of shaping the American variety of Spanish as a result of prolonged colonial development, intensive contact with indigenous languages, and continuous interaction between European and local cultural codes. The study identifies the main stages in the evolution of Spanish from the period of the conquest to the present day and characterizes its phonetic (seseo, yeísmo, /s/ elision, /n/ velarization), morphological (voseo, ustedeo), and lexical (indigenisms, archaisms, anglicisms) features. Particular attention is given to the issue of linguistic interference, bilingualism, and the influence of indigenous substrates (Nahuatl, Quechua, Guaraní) on the phonetic and grammatical structure of the language. It is shown that the varieties of Spanish in different regions of the Americas (the Caribbean, the Andes, the Río de la Plata, and Central America) form a polycentric system with consolidated internal norms. A comparison of the features of American Spanish with the southern dialects of Spain (Andalusian and Canarian) makes it possible to identify archaic features and regularities of typological affinity. The study deepens the current understanding of the variation and polycentric nature of the Spanish language, revealing the dynamics of linguistic identity formation under conditions of multilingualism and cultural interaction. The methodological basis of the research combines historical-comparative, typological, areal, and sociolinguistic analyses, ensuring a comprehensive approach to the object of study. The results obtained have practical significance for the teaching of comparative linguistics, linguistic cultural studies, and Romance philology and may also be applied in further research on language contact, language policy, and sociolinguistic typology.