What does Presidios do in AoE3?

Fort: build limit +1, Wood cost −40%, Coin cost −40%, build time −20%; General: building rate set to 1; General: building rate set to 1; Outpost: Wood cost −30%, build time −20%. The game says: "Enables Generals to construct Outposts and an extra Fort. All defensive buildings are cheaper and build faster."

Home City card

Presidios

Presidios (tech ID DEHCPresidios) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Colonial Age. Effect: Fort: build limit +1, Wood cost −40%, Coin cost −40%, build time −20%; General: building rate set to 1; General: building rate set to 1; Outpost: Wood cost −30%, build time −20%.

Quick answers (3)

Which civilizations have the Presidios card?: Mexicans.
What does Presidios do in AoE3?: Fort: build limit +1, Wood cost −40%, Coin cost −40%, build time −20%; General: building rate set to 1; General: building rate set to 1; Outpost: Wood cost −30%, build time −20%. The game says: "Enables Generals to construct Outposts and an extra Fort. All defensive buildings are cheaper and build faster."
What is the tech ID of Presidios?: DEHCPresidios.

Enables Generals to construct Outposts and an extra Fort. All defensive buildings are cheaper and build faster.

What it does

Fort: build limit +1, Wood cost −40%, Coin cost −40%, build time −20%
General: building rate set to 1
General: building rate set to 1
Outpost: Wood cost −30%, build time −20%
Walls: Wood cost −20%, build time −20%

2 further effects (interface, visuals or AI) not listed.

Cost: 1
Sent from: II
Times it can be sent: 1
Game ID: DEHCPresidios

In these decks

MexicansII×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).