7
Before the Civil War, the South's economy relied heavily on slave labor. After the Civil War ended slavery, slave labor was mostly
replaced by

what does the teacher mean

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).

the answer would be plantations