Good map! An interesting project.
Mountains are beautiful.
And the possibilities of developing a great map are very high!
I think you have to work a lot on colors, i'm not colorblind but there're some zones that are very difficult to distinguish.
For exemple Meso America color is "invisible" in the legend.
Plateau is difficult to find on map.
You have to make more clear some regions....
Where is Eyak and where is tlingit?
What regions Beothuk can attack?
I suggest you to "remove" the northern zone of copper region, make only confusion
Personally i think the legend is very big
You need to balance the game, a good start in the south could be an easy +2 bonus (for meso america) withonly 1 border to defend (coahuiltee)
Rivers make the east zone impenetrable, Mountains do the same in the west part, and there's a big vertical central zone in which seems more difficult to find a quick way to take the dominance during the game.
Any suggestions for bonuses now...
Anyway, your map is one of the best i've seen in the last period.
C'mon! Make really great this map