Yeah, the implementation of the NA's are strange in this game. Their troops are less than half the price and upkeep costs of other factions' units, from what I've seen. Their melee troops could also go toe to toe with line infantry with socket bayonets. Their lancer cav took out 30 out of 120 units of line infantry in square formation on their initial charge. Their bowmen outrange line infantry and have a deadly rate of fire that is much faster.

What happens is a spam of quality troops. Even with relatively bad economic upgrades, they can afford to spam units. What's more, these units are almost as good as European units for the most part. They have 20-stacks of good units that can go toe to toe with European units. I've had way more trouble with them that I've had with the Spanish.