Answer:
The Great Wall impacted the people of China because it was a great source of protection that is the main reason they built it in the first place. Without this amazing stone and brick structure protected the Han, Qin, Ming and many other dynasties could not be protected without it.
Because once an indentured servants time is up, you have to let them live their own life, but if you have a slave, you literally own them and keep them until they die if you choose to do so.