Input the following for the territory you want under your control in the in-game cheat menu:

B, X, X, B, B ... Great Plains
B, X, X, B, A ... Great Lakes
B, X, X, B, X ... Dakotas
B, X, X, B, Y ... Central Heartland
B, X, X, A, A ... Northern Texas
B, X, X, A, B ... Southern Texas
B, X, X, A, X ... Arizona Territory
B, X, X, A, Y ... Oklahoma Grasslands
B, X, X, Y, B ... New Mexico
B, X, X, Y, A ... Great Basin
B, X, X, Y, X ... Northern California
B, X, X, Y, Y ... Southern California
B, X, X, X, A ... Arcadia Plains
B, X, X, X, B ... Northern Cascades
B, X, X, X, X ... Southeastern Arcadia
B, X, X, X, Y ... Central cascades

Input X, X, A, A, Y to add money to your game account. (Unverified)