Umayyad Caliphs managed to expand their empire because the Byzantine and Persian empires were weak.
Five Score Years Ago Is more appropriate because it is another way of saying 100 years ago and 1863.He repeats one hundred years later to let you know that this is after four score years ago.
True. Research this so that you know about it next time.
india resisted mongol invasion---> the mongols invaded baghdad
Dheli became---> they were unable to convert
and you know the last one
Does this help