Re-order paragraphs

c) In the early years of the twenty-first century the impact of immigrants on the welfare state has become a staple of discussion among policy makers and politicians.

d) It is also a recurrent theme in the press, from the highbrow pages of Prospect to the populism of the Daily Mail.

a) Inevitably, these discussions focus on present-day dilemmas.

b) But the issues themselves are not new and have historical roots that go much deeper than have been acknowledged.