Answer:
To achieve his purpose, Jackson encouraged Congress to adopt the Removal Act of 1830. The Act established a process whereby the President could grant land west of the Mississippi River to Indian tribes that agreed to give up their homelands.
I suppose it made the free states and slave states in some way even. When Missouri became a slave state they kept the north end of the Louisiana purchase free stated and banned slavery there.
A psychologist is an expert or specialist in psychology. Psychology is the study of the human mind and its functions.