Which civilizations have the European Cannons card?

Chinese, Japanese, Ethiopians, Hausa, United States and Mexicans.

What does European Cannons do in AoE3?

War Ship: range (Broadside) +2, range (Siege) +2, range (Ranged) +2, range (Roundel) +2. The game says: "Warships have more range and greater attack."

Home City card

European Cannons

European Cannons (tech ID YPHCEuropeanCannons) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 6 civilizations, sent from the Colonial Age and Fortress Age. Effect: War Ship: range (Broadside) +2, range (Siege) +2, range (Ranged) +2, range (Roundel) +2.

Quick answers (3)

Which civilizations have the European Cannons card?: Chinese, Japanese, Ethiopians, Hausa, United States and Mexicans.
What does European Cannons do in AoE3?: War Ship: range (Broadside) +2, range (Siege) +2, range (Ranged) +2, range (Roundel) +2. The game says: "Warships have more range and greater attack."
What is the tech ID of European Cannons?: YPHCEuropeanCannons.

Warships have more range and greater attack.

What it does

War Ship: range (Broadside) +2, range (Siege) +2, range (Ranged) +2, range (Roundel) +2, range (Roundel Pierce) +2, range (Ranged Attack Contained) +2, range (Charge Broadside) +2, line of sight +2, damage +15%

Cost: 1
Sent from: IIIII
Times it can be sent: 1
Game ID: YPHCEuropeanCannons

In these decks

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