If that is true in immigrant-created, multiracial, multicultural America, a vast and churning continent, always restless, always changing, it is triply true in the little, overcrowded, once remarkably homogeneous island that is Britain. This country’s core identity is thousands of years old. Yes, it has long accepted immigrants, but until the 1950s, net immigration was a rounding error. 

                                       – Andrew Sullivan

…have you read Ivanhoe?