Hecetaeus of Miletos

[Arjos]

Unless the newcomers are militarily over-whelming then we generally see continuation in language with small adjustments. What we see with militarily strong incomers is a nuanced (socially stratified) taking up of the incomers' language.

Chariots and the addomestication of horses definitely helped on that...
Just think of the importance of chariot burials, which were probably adopted or brought by a very tiny number of people that far into central Europe...

As for ideological preferences; I understand what you are saying but equally; Rome's expansion was based upon an ideological conception of what Rome was (or, perhaps many of which one particular concept won over the rest). The idea of a shared Italian (as well as English. German, French) languages are ideological concepts. Ideology has an impact linguistically, culturally and economically. In fact it was on the basis of the ideological (and consequent economic and cultural) impact of Rome that I argued its legacy as not being particularly positive in another thread.

Absolutely, I was merely saying that the ideology came after. Not that the locals said to themselves 'Hey, being X instead of Y is way cooler!' :P
But language is indeed the vehicle of ideas ^^
My point was that what is most important is sustenance, that's why new ideologies can be adopted by 'foreigners'...