By opening the whole territory between Tennessee on the north and Louisiana on the south to the settlement of the whites it will incalculably strengthen the southwestern frontier and render the adjacent states strong enough to repel future invasions without remote aid. - President Andrew Jackson, message to Congress

How did President Jackson plan to accomplish the goal mentioned in this excpert?
A. By removing local tribes from those lands.
B. By purchasing the land and selling it for a lower price.
C. By using federal money to strengthen local economies
D. By denying citizen land claims from the colonial era.