What did the Seljuk Turks do that made the Byzantine Emperor worry?

What is the acronym to remember when evaluating source information?

What was the significance of john hancock's signature on the declaration of independence?

At the time of the brown v. board of education decision, schools were segregated everywhere in the country. several states had laws requiring segregated schools. schools in nearly every state has been desegregated. segregation was common in the north, but not in the south.