Trid , Jesus repeatedly addressed these ethnic biases .  By making the Samaritan the hero and ministering to e.g. the Roman Centurion and the Syro-Phonesian woman  .
And other persons , too .  Calling the Tax Collector to follow  , etc.  Matthew was a collaborator with an occupational force  !  
One definition of a slave is someone whom God rushes to set free  .  Enslavement is not
just an evil for the slave it wreaks dreadful harm on the one who presumes to "own " a fellow human being  .  Witness Charlottesville this past weekend  .   Those memorial 
statues glorify evil  .  Growing cotton destroyed the soil and imprisoned everyone it touched  .  Even the South itself which agressively  sought to claim more territory to the west was a backwards entity  .  
Slavery was a scourge .  England was far ahead of America in renouncing it  .