Why do scholars disagree about the Proto-Indo-European homeland?

Scholars disagree about the Proto-Indo-European homeland primarily because linguistic evidence alone cannot precisely determine the time or location of the language's origin, and archaeological findings are often open to multiple interpretations.12

Currently, the debate centers on two primary hypotheses:

• The Pontic-Caspian Steppe Hypothesis: Many scholars associate the speakers of Proto-Indo-European with the Kurgan culture of the region north of the Black Sea and Caspian Sea. This theory links the expansion of the language to the advent of horse-drawn wheeled vehicles and social changes occurring around 4000 BCE.312
• The Anatolian Hypothesis: Proponents, such as Colin Renfrew, argue that the language originated in Anatolia around the 7th millennium BCE, suggesting that Indo-European languages spread into Europe alongside the introduction of agriculture during the Neolithic Period.32

Disagreements persist because there is no single archaeological pattern that definitively corresponds to a migration on the scale required to explain the spread of these languages, leading to ongoing questions about how material culture relates to language and ethnicity.3