Case study: general andrew jackson: andrew jackson's military career spanned several wars including the american revolution, the creek war, the war of 1812, and the first seminole war. after the creek war, jackson and the creek indians signed the treaty of fort jackson in which the creeks ceded lands in georgia and alabama to the u. s. during the war of 1812, jackson drove the british out of new orleans and florida, thereby proving the strength of the newly formed united states. what main impact did andrew jackson have on the geography of the southern states? he double the size of the u. s. he doubled the size of the southern region of the u. s. he expanded the territories of florida, georgia, and alabama. he added territory to louisiana, mississippi, and south carolina.