For as long as humanity has existed there has been slavery, upper and lower class, kings, peasants, racism and hatred for one class or another. Everywhere humanity goes we spread inequality like a disease.
The Romans denied the Northern tribes equal protection, and it contributed to the downfall of Rome.
Southern slave owners helped tear this nation apart with a civil war.
The civil rights movement of the 1960s turned violent.
Now gays are the primary focus for civil rights.
This time period we live in has been a turning point for humanity.