What was the primary purpose of southern implementation of black codes?

For PLATO users, the answer is:

C.)

"To ensure that blacks would remain landless and subservient".

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement

question 10: the answer is c, to their constituents address a problem.

question 11: i think it would be domestic bills, which deal with american issues only and public bills, which affect the whole nation.