Witch is not one of the three main periods history has been divied in to?

People who agreed to work in exchange for passage to the colonies

Why was the taiping rebellion significant

Chief justice earl warren stated, “separate educational facilities are inherently unequal.” what did the use of “inherently” imply about segregation? 1/ by its very definition, it cannot be equal. 2/ it is an integral part of american society. 3/ based on its meaning, separation is a natural inclination. 4/ it was intended to be a state right, not a national mandate.