I'd say it's reproduction, it's just not voluntary reproduction. Every time a culture invades another, you can think of it as creating a new culture that has th

I'd say it's reproduction, it's just not voluntary reproduction. Every time a culture invades another, you can think of it as creating a new culture that has the "genes" of the previous two. Examples include the influence of the moors on Spain, the changes to the English language due to the Norman conquest, and the modern unique Afrikaner culture of South Africa.