Under the ethnically colour-blind “French model”, the immigrant workers who came in the 1950s and 1960s from the former colonies in North and black Africa were to be regarded as equal citizens. They and their descendants would take advantage of the education system and generous welfare state to assimilate with “white” France. To promote the idea of assimilation, neither the State nor any other body publishes statistics on ethnic or national origin.

In practice, France turned its back on the minorities....