When Columbus returned to Spain  he sought permission from Pope Alexander to claim all of the land he discovered for Spain and to subjugate all pagans, saracens and Non Christians inhabitants the lands he dicovered.

It was the position of the Church that White Euriopean Christian were superior to all other races. religions and creeds..

The predominately Christian colomies embtaced the Papal Bull, known as the Doctrine of Discovery issued by Pope Alexander and the rest is history.

The Constitution was written by an oligarchy of rich white Christian men that wanted to maintain their positions in the socio-economic heirarchy for themselves  and their posterity.

For hundreds of years the men and women from Africa who were  imported to the Unted States to labor in the fields of the financial elete were considered to be property rather tgan people. 

Twety five of the fifty five delegates to the Constituriional Convention owned slaves and had a vested interest in preserving the institution of slavery.