Why is South America considered one of the world’s most linguistically diverse regions?

South America is considered one of the world’s most linguistically diverse regions due to a combination of historical, geographical, and temporal factors that have fostered extreme differentiation among its indigenous languages.12

The primary reasons for this diversity include:

• Extended Isolation: Scholars attribute the high level of diversification to the significant amount of time that has passed since various South American groups lost contact with one another.1
• Geographical Filtering: The Isthmus of Panama acted as a geographic filter for migrating groups coming from North America. This process caused many intermediate linguistic links to disappear, meaning that many groups entered the southern continent already linguistically distinct.1
• Lack of Interaction: The continent’s vast and varied terrain, including the Andes and the Amazon basin, contributed to the isolation of many tribal units, preventing the homogenization of languages.32

This diversity is so profound that researchers have struggled to establish a definitive classification system, with estimates of the number of languages ranging from 1,500 to over 2,000. Because many languages are now extinct or lack sufficient documentation, the true extent of this linguistic variety remains difficult to assess.13