Because, they were property to their slave masters, and the slave masters could do anything that they wanted to the slaves in order for the slaves to keep their lives.
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The white men emotionally, physically, psychologically and verbally abused the slaves. Some were even so cruel to deliberately separate families, rape domestic slave women and then neglect the children, severely punish them for minor offences such as answering back to a master could mean death by drawing and quartering which is being pulled to pieces by horses. They tried to make slaves think they were worthless and deserved to be treated in the worst way. Especially in British colonies slaves were overworked and humiliated, underfed, tortured and slavery was until death. Slaves could not be married, be educated or could not even become Christians if they wanted to. It is therefore quite obvious why slaves wanted to kill their white masters after the abuse and torture they experienced for generations.
So angry and humiliated that some of them started-up the Ku Klux Klan.
25% of southern slaves owner owned slaves. They had more then 50 slaves
This depends entirely on the slaveholding society. Historically, the largest numbers of slaves have been African (Black) slaves, especially in the Americas, but there have been numerous White Slaves, East Asian Slaves, Indian Slaves, and Native American Slaves in different places and at different times.
land and slaves.