What does Cronstedt Reforms do in AoE3?

Leather Cannon: population −1; Falconet: population −1; Heavy Cannon: population −1. The game says: "Leather Cannons, Heavy Cannons, and Falconets take up one less population slot."

Home City card

Cronstedt Reforms

Cronstedt Reforms (tech ID DEHCCronstedtReforms) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Leather Cannon: population −1; Falconet: population −1; Heavy Cannon: population −1.

Quick answers (3)

Which civilizations have the Cronstedt Reforms card?: Swedes.
What does Cronstedt Reforms do in AoE3?: Leather Cannon: population −1; Falconet: population −1; Heavy Cannon: population −1. The game says: "Leather Cannons, Heavy Cannons, and Falconets take up one less population slot."
What is the tech ID of Cronstedt Reforms?: DEHCCronstedtReforms.

Leather Cannons, Heavy Cannons, and Falconets take up one less population slot.

What it does

Leather Cannon: population −1
Falconet: population −1
Heavy Cannon: population −1

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

In these decks

SwedesIV×1

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