Race baiting hate fest. Revisionist history propaganda. Message: Slaves did all the work in the country while racist whites sat around and drank lemonade. (they left out the part about half million whites gave their lives freeing the slaves, but hey, they were probably white supremacists anyways)
I suggest you LET your kids watch it and explain how this is typical leftist race baiting hatred and it should be rejected and resisted. Counter all the lies with the truth and teach your kids that they should expect to be bombarded by these psyops on a daily basis.