$100,000 into your Treasury:
At the big map of Campaign mode at the 'Start' menu go to the 'Cheat' menu and press X, X, A, A, Y. This can be done multiple times and you recieve $100,000 each time.

Unlockable Territories:
Enter the following codes to take control of the following individual territories.To enter the codes start a campaign and press 'Start' then go to the 'Cheats' menu to enter the code.

Arcadia Plains:
B, X, X, X, A

Arizona Territory:
B, X, X, A, X

Carolinas:
B, X, Y, X, A

Central Cascades:
B, X, X, X, Y

Central Heartland:
B, X, X, B, Y

Cumberlands:
B, X, Y, X, Y

Dakotas:
B, X, X, B, X

Eastern Shenandoah:
B, X, Y, Y, B

Florida:
B, X, Y, X, B

Great Basin:
B, X, X, Y, A

Great Lakes:
B, X, X, B, A

Great Plains:
B, X, X, B, B

Mississippi Delta:
B, X, Y, X, X

New Mexico:
B, X, X, Y, B

New York:
B, X, Y, Y, Y

Northern California:
B, X, X, Y, X

Northern Cascades:
B, X, X, X, B

Northern New England:
B, X, Y, Y, A

Northern Texas:
B, X, X, A, A

Ohio Valley:
B, X, Y, Y, X

Oklahoma Grasslands:
B, X, X, A, Y

Southeastern Cascades:
B, X, X, X, X

Southern California:
B, X, X, Y, Y

Southern Texas:
B, X, X, A, B