In Brown v. Board of Education, the Supreme Court was considering whether or not segregated schools was permissible under the US Constitution.
The Court ultimately ruled that segregated schools were unconstitutional.
If I remember correctly, the town of Oak Ridge was cut off from the world and the workers were brought there to build atomic bombs.
A current example of cultural diffusion is that carried out by the association Contraluz, founded some twenty-five years ago, in the city of Avignon (France). There Spaniards of origin, who had to migrate from that country can take Spanish classes and promotion of gatherings to practice it, exhibitions of painting and photography, lectures on the history and the current situation of Spain and the Ibero-American countries, screening of Spanish films and Latin American, promotion of music and dance, from the sevillanas and flamenco, to the Latin rhythms of the other part of the Atlantic.
The country that does is Japan. Literally, it's always countries like The united states, or Europe. They are very very big on control. right next to China .-.