It seems like the message being pushed in most commercials with interracial couples is for blacks to marry whites and to eventually mix in and disappear into the general population.
Argentina has a significant black population a couple of hundred of years ago. Today there are barely any Argentinian blacks. For years, people hypothesized that they were killed by diseases, in wars or moved away. But DNA testing has shown that they assimilated into the mostly white Argentine population.
Asians, Hispanics, Arabs, South Indians are always shown where both people in the couple are the same race….an Asian wife and an Asian husband. So it seems like the message is, it's ok for Asians or Hispanics to marry the same race but blacks should assimilate so in a few generations they disappear.