This seems rather obvious, since all the slaves were black.
But slavery remained in Brazil until 1889, and racial intermarriage there was officially encouraged because all that mattered was that a person was Catholic. The official policy throughout the Latin colonies was assimilation or, in Brazil’s case, asimilacion.
But you would still play hell arguing that being pro-slavery did not imply one hell of an attitude toward blacks. You would be LAUGHED at for even hinting that it showed no racial attitude.
Because all the slaves were black, of course!
Today nobody but BUGS laughs when someone says that the push for immigration and assimilation , even though it is only white majority countries, and ALL white majority countries, that are under international pressure to take in mass third world immigration and assimilate with it.