Answer: they were objects that belonged to their masters and not considered people or citizens.
During the Civil War the northerners fought because they were against slavery, the southerners fought because the slaves did the work for them.
The military and political prowess of the King of Qin
The First Emperor was a brilliant at political strategy and the consolidation of power. He was also a strong military leader whose methods included massacre which led to his success at unifying the states