Historians will look back on the past few decades and identify immigration as perhaps the major change to our country. There have been two big phases of immigration. The post-colonial phase lasted from 1948 until the early 1990s. It brought to Britain around two million people from the Caribbean, India, Pakistan and Africa. By the end of this period the number of ethnic-minority Britons stood at four million. The second phase, which coincided with a huge shift in the global movement of people, started in the late 1990s. Net immigration of non-British citizens has added another four million to the population in just 15 years.