England and similarly dense countries like Bengala-Desh are horribly overcrowded. The locals are desperate to send home immigrants and refuse even to replace themselves by having enough babies.
And that's after concentrating a large population in Europe's largest city so that they can at least have a little open space elsewhere.
As a long-term resident of one of the most diverse boroughs in London, I can vouch for my own lack of desperation to deport immigrants, though I'm sure you can find the same xenophobic vocal minority that can find in most countries if you look hard enough. Though I do conceed that I am finding the task of replacing myself with a baby somewhat difficult, which may or may not be due to lack of large, sparsely populated land mass.
And that's after concentrating a large population in Europe's largest city so that they can at least have a little open space elsewhere.