R1b is a mixture of many kind people. They brought IE languages to Europe, but also those like Basque, while R1a brought only IE languages.
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Wrong, R1b brought non-IE AGGLUTINATIVE languages into Europe, Basque and Bashkirs are the last remnants. Celtic is agglutinative, too, a totally non-IE feature. R1a in India is Scytho-Turkic not IE. The same can be said about R1a M458 in Eastern Europe and Finno-Ugric Z280!
Both R1a and R1b are steppe people who settled in Celtic Europe (by conquering it) post 4th century A.D
They conquered.
1. Germania
2. Gaul (then named it France9
3. Italy (then named it Lombardy then Italy again)
4. Britain (also killed Celts)
etc...
Latin language was invented by Pre-Lombard, Frankish, Norman Italians. Those people are minority in Italy nowdays.
Europe was I1, I2, J2, E1, G2 = R isn't European.