The decline of the Abbasid Caliphate

History

Which empire was the Abbasid Caliphate fighting in the ninth century?

Local rulers were breaking away from Baghdad.

There wasn't enough silk being transported from China.

What problem did caliphs face by the end of the ninth century?

Who took power from the Abbasids in North Africa?

Who did the caliphs bring to Baghdad to encourage learning?

What was the name of the place in Baghdad where learning took place?

Which advance was made by scholars in mathematics?

What did the Muslims discover about the Sun?