Black Lives Matter, the slogan of a movement of the american fight against violence and racism against Blacks, became the rallying cry during protests that followed the death of George Floyd. A phrase that can be translated as : “The lives of black count “. Beyond police violence, they are also the many inequalities that denounce these protesters. The categories of racial or ethnic origin, authorized in the United States, is included elsewhere in the questionnaire of the census made every 10 years and provide a economic and social landscape of the nation.