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According to Kortlandt, Indo-Uralic is the pre-PIE, postulating that Indo-European and Uralic share a common ancestor.According to Kortlandt, "Indo-European is a branch of Indo-Uralic which was radically transformed under the influence of a North Caucasian substratum when its speakers moved from the area north of the Caspian Sea to the area north of the Black Sea." Anthony notes that the validity of such deep relationships cannot be reliably demonstrated due to the time-depth involved, and also notes that the similarities may be explained by borrowings from PIE into proto-Uralic.

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Archaeological research has unearthed a broad range of historical cultures which can be related to the spread of the Indo-European languages.

Various steppe-cultures show strong similarities with the Yamna-horizon at the Pontic steppe, while the time-range of several Asian cultures also coincides with the proposed trajectory and time-range of the Indo-European migrations.

By the early 20th century, well-defined descriptions of PIE had been developed that are still accepted today (with some refinements).

The largest developments of the 20th century have been the discovery of Anatolian and Tocharian languages and the acceptance of the laryngeal theory.

Linguistics describes the similarities between various languages, and the linguistic laws at play in the changes in those languages.