Yeah but it's taken France alone over 200 years to get a bit like your video and that multiculti scene is mostly confined to select parts of cities and some towns - The rest is still French, you know??
I just use France as an example because it's currently in the news for doing what it always has(for 200 years) done - Manage the Africans while squatting their resources in their lands
en.wikipedia.org
Look at the size of the Empire(compared to french territory - Read up on the T & C's of Giving & Taking.
Then consider all European Countries have been working abroad closely, intimately with the foreigners, Ireland too, you know??