IE = language group
Indo-Europeans refers to the language group, and entered western Europe around 5,000 years ago or so. The "aboriginal" Europeans had been there since repopulating the region north of the Alps after the LGM, and spoke various non-IE languages (now extinct). The main academic arguments seem to concern whether or not Neolithic agriculture arrived with the Indo-Europeans or arrived earlier. But don't ask me for sources, since I don't keep track.
R1a1a & U5b2
Indo-Europeans refers to the language group, and entered western Europe around 5,000 years ago or so. The "aboriginal" Europeans had been there since repopulating the region north of the Alps after the LGM, and spoke various non-IE languages (now extinct). The main academic arguments seem to concern whether or not Neolithic agriculture arrived with the Indo-Europeans or arrived earlier. But don't ask me for sources, since I don't keep track.
R1a1a & U5b2
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