Cheat Menu:

Hold Alt and type WIN, and you get a cheat menu at the top of the screen. When you're on the Country select screen, click on a red box which is beneath Spain. If you click this, you will go to a country called 'Spring' and you can control all of the nations at the same time.

These are things you can't find in the cheat menu.

After you typed ALT + win

You can use the following keys:

SHIFT + 1 Finishes all buildings in a city up to the maximum. If you do this ofter you can have a warehouse in which you store thousands of items
SHIFT + 4 Adds a thousand cash to your treasury
SHIFT + 5 Select any good (guns?) and this will give you 100 extra
SHIFT + 6 Select any good and it will take 100 of it In a city,
SHIFT + T a new colonist is added.
SHIFT + S specializes the selected colonist tothe task he is doing. for instance a statesman becomes an elder statesman.

If you're up to some real exciting game open the names.txt file. There you can alter nearly anything, like the cost of recruiting units and the appearance of the founding fathers. Put Cortes to 20 in the first position and you'll be able to recruit him as the first one. You can also alter the harvest you get from several terrains etc., so you can for example gather 50 ore from sea water if you want. The opponents have the same advantages however so be carefull how to use it. And of course, you should back up you original names.txt first