Birth rate gap? https://en.wikipedia.org/wiki/Demographics_of_Serbia
It happens everywhere that Islamic ethnic groups replace others with population explosion.
Serbs have moved to Serbia, Croats to Croatia, Muslims have moved out of these. This was result of a mix of fear, actual violent ethnic cleansing by extremists, but also within each population, just a desire to live within one's own ethnic and religious enclave.
And the ethnic cleansing is happening everywhere in Europe now. Muslim enclaves with only tiny amounts of non-muslims are a fact in every Western European city I know about.
That's a ridiculous claim.
Here's a list of largest cities in the European Union by population within city limits. This list ranges from cities with population over 8million (London) to 315,000 (Catania).
https://en.wikipedia.org/wiki/List_of_largest_cities_in_the_...
You have no idea what happens in most of those cities, yet you make this claim anyway.
And you focus on muslims, ignoring the strong tendency of some (but not all) immigrants to live in communities.
When I do it I'm an ex-pat. When they do it they're evil muslim scum, right?
EDIT: You may wish to re-read dang's comment here: https://news.ycombinator.com/item?id=11518006