How do castles work for Native Americans?

They historically didn't have castles, so do they need castles to produce their best units?

In the Americas campaign there are no castles. All units including the Spanish are trained in cities.

Also, as Apacheans, you don't really have a town either. Just a mass of teepee's huddled together. If your playing Chichimecs, Mayans, Aztec, etc, then you get cities with walls and stuff.

never mind

In the manual, it says that I can look up the building planner in the medieval folder.

I can't find it. Do you guys know where it is?

The planner is on the disk in a .pdf file.