Potiphar
They didn't, only Joseph became a slave, he became a slave beacause his brother Simion sold him to slave dealers, and they took him to Egypt where the Pharaoh bought him.
He worked for Potiphar
Slave traders bought them and brought them on slave ships
They bought a new one
from a slave auction
they went a brought it home. If they went by carriage the slave would walk.
The slave owners bought their slaves at auctions.
Slavery has been around for thousands of years. It is impossible to know who or where the first slave was bought
Potiphar
Benjamin Banneker's mom was not a slave but his mom bought his dad as a slave then they got married and had Benjamin.
Same way as any property . There were also slave auctions.
fugitive slave lawsfugitive slave act