How did European colonization spread Spanish and Portuguese to the Americas?

The spread of Spanish and Portuguese to the Americas was a direct consequence of European colonization beginning in the late 15th and 16th centuries. Following the Age of Discovery, Spain and Portugal established colonial empires, effectively exporting their respective languages to the regions they occupied.1234

The division of these territories was formalized by the Treaty of Tordesillas in 1494, which drew an imaginary line in the Atlantic Ocean; lands to the west were assigned to Spain, while those to the east were assigned to Portugal. Consequently, Spanish became the dominant language across most of Central and South America through colonial administration, settlement, and the establishment of government structures like the encomiendas. In contrast, Portugal focused its colonization efforts on Brazil, establishing it as the primary Portuguese-speaking region in the Americas.215467

In both colonial frameworks, Christian missionaries played a significant role in the spread of these languages, often using them alongside indigenous tongues for evangelization. Over time, these European languages became the official and primary languages of the resulting nations, though they were influenced by local indigenous languages and immigrant populations.18674