@Færd On the other hand, people can be highly motivated by ideology.
Cf. the Wars of Religion in Europe, the Islamic conquest of large parts of the world, the Communist conquest of Russia, various Nazi policies that were even detrimental to the economy and long-term future of Germany, the nationalist rivalry between India and Pakistan, etc.
Of course each of those is different, but it is quite possible that ideological reasons were an important factor.
It's almost always a combination of economic and ideological reasons.
It's hard to determine the relative importance of either factor.
@Mitch I have read Linear B at university: it has been deciphered.
It was used to write early Greek (Mycenaean).
Linear A remains undeciphered. It may have been used to write in a Minoan language, but I believe we know little about Minoan languages.
@Færd Indeed not; but increased religiosity usually means more conservatism. Mild, less strict forms of religion can be quite liberal; but I would aequate 'stricter' to 'more religious'.
@Mitch Yes, rural areas tend to be more conservative everywhere, whence my as it is the case in most countrysides.
@Mitch Well, initially, they were actively sought by the Dutch, and they looked in certain regions (I don't know how they did it exactly). They did not actively try to recruit people from e.g. Casablanca: their efforts focused on the Rif. Then the group that emigrated from there become the core of the later community: once active recruiting had ended, new immigrants came because they had family ties to the core community of immigrants that were already here. It's wasn't random people.
@Mitch We're all influenced by our backgrounds in some ways, but some more than others. Maybe you're influenced much less than most people.
@Mitch That is not always the case—that is, it depends also on the culture of the receiving country, and on one's interpretation.
In Holland, for example, immigrants were not pushed to assimilate at all: they were free and even encouraged to mostly keep with their native culture and hang out with people from the same background.
In other countries, there was more pressure to assimilate to the recipient culture a. s. a. p. (look, @Tonepoet).
But I agree with you that the first generation is generally more 'docile'.