What does Port Veracruz do in AoE3?

Fort: range (Cannon) +6, range (Anti-ship) +6, range (Siege) +6, line of sight +6; Ships 1 Spanish Treasure Chest. The game says: "Forts have more range and become able to attack other buildings."

Home City card

Port Veracruz

Port Veracruz (tech ID DEHCFedMXPortVeracruz) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Fort: range (Cannon) +6, range (Anti-ship) +6, range (Siege) +6, line of sight +6; Ships 1 Spanish Treasure Chest.

Quick answers (3)

Which civilizations have the Port Veracruz card?: Spanish.
What does Port Veracruz do in AoE3?: Fort: range (Cannon) +6, range (Anti-ship) +6, range (Siege) +6, line of sight +6; Ships 1 Spanish Treasure Chest. The game says: "Forts have more range and become able to attack other buildings."
What is the tech ID of Port Veracruz?: DEHCFedMXPortVeracruz.

Forts have more range and become able to attack other buildings.

What it does

Fort: range (Cannon) +6, range (Anti-ship) +6, range (Siege) +6, line of sight +6
Ships 1 Spanish Treasure Chest(unit)

1 further effect (interface, visuals or AI) not listed.

Cost: 1
Sent from: IV
Times it can be sent: 1
Game ID: DEHCFedMXPortVeracruz

In these decks

SpanishIV×1

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