This local divergence may proceed as rapidly as through wide geographical segregation or isolation.
Segregation on reservations was generally accomplished in 1870-1880.
Several important attempts have been made to effect a segregation as between state and local taxes, but for the most part without success.
The Apartheid caused there to be segregation in the schools between different races.
It is equally clear that there is a broad analogy between the kind of characters on which systematists often have to rely for the separation of species and those which Mendelian workers have shown to behave in accordance with the Mendelian theories of mosaic inheritance with segregation.