An 18th century depiction of the casta racial classification system created by the Spanish. The painting is in the Museo de Virreinato, Tepozotlan; image from
From the U.S. Declaration of Independence (1776), world-wide known for its initial statement that "[A]ll men are created equal," also included the following passage:
"[T]he inhabitants of our frontiers, the merciless Indian Savages whose known rule of warfare, is an undistinguished destruction of all ages, sexes and conditions."
Perhaps a not-so-crazy "alternative history" question: Would Jefferson, the drafter of the Declaration, have advocated building a wall in the newly-created United States of America to keep (to use contemporary US political language) "drug-dealing, rapist hombres" out of the city upon a hill?
***More on slave-owning Jefferson [footnote notations are from original entry]:
Thomas Jefferson believed Native American peoples to be a noble race  who were "in body and mind equal to the whiteman"  and were endowed with an innate moral sense and a marked capacity for reason. 
IS THE ONLY "AMORAL" LESSON FROM ALL THIS IS THAT HISTORY IS COMPLICATED/MERCILESS? ...