1) They mostly spread Islam through conquering new countries. What they did also was unite all people under a single rule and ended religious uprisings.
2) There was tensions because one faction believed that Muhammad should be succeeded by someone chosen by people, while the other faction believed that his successor should be someone from his bloodline.
Slavery was given to them, they bought their rights and they felt like that was justification for buying blacks.
Answer:
False
Why:
Cause I know