populations of ancient italic tribes

Modern theory about the genetic history of Italy says that we are all genetically Italians.

It is correct to say that Italians don't descend from an "Italian tribe", but from an ethnic stock made of various Italic tribes. They didn't speak one language, but despite this they had a common origin and cultural backround. Rome itself was a mix of more Italic tribes: Romans were a mix of Etruscans, Samnites, Campanians and Gauls from Northern Italy. During the III century b.C. Romans conquered the Celtic peoples of Northern Italy, unifying the "boot". It is since that moment that it start the process of creation of the Italian people/folk as we know it today. In the year 7 a.D. the inhabitants of Italy are, according to the Roman Augustean census, an omogeneous and united people of 10 millions of individuals (during the previous centuries there happened internal migrations that levelled the people).

After the fall of the Roman Empire the barbaric invasions altered very few or nothing at all the genetics of Italy. The Caliphate of Sicily, after the Norman reconquest, saw the deportation of all the Arabic people to a little city of Puglia, in which they were segregated. The inhabitants of that sort of ghetto were slaughtered by the Christians 2 centuries later.
The biggest contribution that Berbers left was in Sicily (7,5%) and Northern-Puglia (6,5%). In the rest of Italy this percentage is only of 0%, 2% in the best ipothesy.
The descendents of Longobards and of the other germanic peoples are attested to be no more than 10% on the continent. The descendents of Greeks on the continent are very low. But they have importance in Sicily, where more than 37% of people seem to be direct descentents of ancient Greek colons.

A study of 2009 shows that Italians, together with the Finns, are one of the purest peoples of Europe and also one of the oldest, descending them from the ancient Italics.

About the (estimated) contributions of the various Italic tribes, their number in 600b.C. was so divided:

-130.000 Lucanians (are of modern Basilicata)
-570.000 Sicules (Sicily)
-450.000 Messapes (Puglia)
-200.000 Brutios (Calabria)
-200.000 Campanians (Campania)
-300.000 Samnites - Samnites of the Mountains (Southern Abruzzo and Molise)
-250.000 Oscos - or Samnites of the Plain (Northern Campania)
-600.000 Etruscans
- 1 Million of Greek citizens (mostly were hellenized Italics)

ROMAN DEPORTATIONS

After the wars against Celts of Northern Italy, Romans forced many of them to leave their native villages and regions, deporting many communities to other regions of Italy.
47.000 Ligures were deported from Liguria to Samnio (Abruzzo and Molise) and Campania.
After the Social war, Rome sent waves of Roman colons to Northern Italy (the number was fixed to 6000 per colonization) in the process of Romanization of Italy. The number of slaves attested was of 75.000 for a population of 10 millions. Most of them were Italics themselves, mostly Brutios, but also Sardinians, Samnites and Umbrians.
Despite this, a soft genetical difference between Northern and Southern Italy is still visible, as underlined by the genetist Cavalli Sforza.

The showed study demonsters also that Italians belong to the genetical family of the Europeans.

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