Villager gather work rate for tree and Mango Grove +20%
Silversmith
Villager gather work rate for mine and Mountain Monastery +20%; land villager changes gather yield for mine and Mountain Monastery +20%
Royal Mint
Villager gather work rate for mines, Estate, Rice Paddy (coin), Field (coin), Mountain Monasteries, and Hacienda (coin) +25%; Hacienda auto gather work rate for coin +25%
Sustainable Agriculture
Villager gather work rate for Mill, Farm, Rice Paddy (food), Field (food), and Hacienda (food) +15%; Hacienda auto gather work rate for food +15%
Spice Trade
Villager gather work rate for hunted animals, Berry Bush, and Cherry Orchard +20%; land villager changes gather yield for hunted animals and Berry Bush +10%
Mercenary and native warrior shipment cost -25%, infinite shipment cost -10% instead, the "Hire Indian Jat Lancer" shipment cost -50% instead, the "Hire Ronin Army" shipment cost -33% instead
Notes[]
In the original Age of Empires III, it's not important to earn large amounts of experience in the campaign. This is due to the fact the player won't be able to Build a Deck like in skirmishes. Any new cards unlocked will not be able to be switched out for inferior cards, so the player is stuck with both. Furthermore, if the player reaches the maximum number of cards allowed in a single age (9), the next card purchased for that age will push one off the list (can never be used again), maybe even one the player wanted to keep. This is not longer the case in Age of Empires III: Definitive Edition, where the player can use the standard deck builder interface.
The player can get a second Factory with the Industrial Age Politician.
Heavy Fortifications and mercenary cards are available in the Fortress Age.
Trivia[]
Level 67 is required to unlock all available cards.
Increasing the Home City level also increases the deck size limit, which can go beyond the number of cards the player can place in the deck (10 per age maximum, so 40).
Several cards in the Military Academy and Laclede's Landing have a purple border, but cannot be sent infinitely. Note the missing infinity symbol in the top left of the icon.