Age Of Empires 3

I had to take a few months off from the game basically right at the release of the Africa DLC. Now that I am back, I almost never see African civs online - are they bad?

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Also, does anyone know why seemingly every other cultural group have many more ways to gain xp than the European ones?

So I've just got the AOEIII DE edition after not playing this game for quite a time now...its amazing!

But I've installed some mods namely some campaigns and custom maps. When I go into single player mode i.e skirmish to enable them, they're not there. It's not even showing up in the scenario folder

Tried to search on youtube but there doesn't seem to be a tutorial for downloading mods directly from AOEIII DE. I have the installed Aztec campaign but I'm lost as to where or how I enable the campaign to directly play it.

Please help!

How does it works, Idont have the first one completed and i cant advance but I have a lvl 9 Aztec home city. Its bugged or im not doing it right?