Violent slave revolts were more likely when

 - most likely slaves

Explanation:

Slave revolts were most likely when slaves outnumbered whites, when masters were absent, during periods of economic distress, and when there was a split within the ruling elite. They were also most common when large numbers of native-born Africans had been brought into an area at one time.

a) the colonists began to see themselves as different from people in britain.