A conspiracy led by this former V.P. aimed to set up an independent nation in the Mississippi Valley
.... By 1863, the Union had established control of the entire 
Mississippi Valley... [DOC] [TLE] Aaron Burr facts, information, pictures | Encyclopedia.com articles ... [PAR] Aaron Burr served as the nation's third vice president from 18011805, having 
lost ... the southwestern United States into an independent nation led by Burr 
himself.