Yes, our diversity can lead to tension. And throughout our history there have been heated debates about immigration and assimilation in both of our countries. But even as these debates can be difficult, we fundamentally recognize that our patchwork heritage is an enormous strength -- that in a world which will only grow smaller and more interconnected, the example of our two nations says it is possible for people to be united by their ideals, instead of divided by their differences; that it's possible for hearts to change and old hatreds to pass; that it's possible for the sons and daughters of former colonies to sit here as members of this great Parliament, and for the grandson of a Kenyan who served as a cook in the British Army to stand before you as President of the United States.