In Age of Empires III: Definitive Edition, all European civilizations have the option to choose revolutionary options to age up at the end of the Industrial Age. However, some of these options may not be historically accurate, as certain revolutions did not occur during the timeline of the game.
To address this issue, I suggest introducing a new form of consulate building that becomes available to some of the European powers only in the Imperial Age. This new consulate building would act as another tiebreaker during long treaty games and grant access to new troops and resources from their empire’s commonwealth. The more consulate options a civilization has, the fewer revolution options it will be given. Technologies researched at the consulate will cost experience points.
Taking the British civilization as an example, their consulate options could be:
Canada:
Mounted Police (Mounties) - acts as normal Dragoons but with a greater range of 18.
Black Watch tech grants access to Highlanders at all military buildings and allows teammates to recruit them from taverns/monasteries if not already available.
Increased line-of-sight tech.
Advanced Felling tech increases wood collection.
Infinite TEAM 1000 wood card.
TEAM surgeon training tech.
Australia + New Zealand:
Australian Ranger (Digger) - acts as normal skirmisher but with greatly increased hit points (wears a pinned Slouch hat).
“Bushrangers” tech sends Tavern wagon (+1 to build limit) and greatly reduces the population of outlaw units, Irish Brigadiers become available if not already obtained.
“New Zealand Lamb” tech increased livestock population (50 sheep + 30 cows).
Wool trade tech reduces the food cost of all units.
South Africa:
Commando - acts like a grenadier but has significant attack multipliers and range resistance against artillery and defensive buildings.
British Askari tech allows training of Askari at the tavern.
Infinite diamond mine prospectus wagons tech.
Whaling tech that creates two pods of whales next to the naval flag spawn point.
Gold Rush tech increases coin collection from mines.
British Raj (India):
Sikh line-infantry (better name needed!) - acts similarly to a Nazim Fusilier.
British Gurkha - same as Indian Gurkha but has a greater melee attack dealt by their Kukri (wears Pillbox hat instead of a turban).
Jat Lancer - same as in-game one.
Infinite 10 villager shipment.
1 villager now comes with each HC card sent tech.
Now let’s look at potential consulate options for the French civilization:
French Algeria:
Algerian Tirailleur (Turcos) - acts like a buffed skirmisher but has no multiplier against ranged cavalry.
Tech that allows training of Zouaves and Gatling Camels in the Tavern.
“Desert Caravan” tech doubles experience points granted at trade posts.
French Indochina:
Tirailleurs Indochinois (Indochinese Sharpshooters) - acts like Pandour, can use stealth ability and excels in countering other skirmishers.
Tech that delivers one Wokou Junk and allows training of up to three in the dock.
Tech delivers 10 Vietnamese fishing boats that don’t take up any population.
Senegal:
Tirailleurs Sénégalais (Senegalese Rifleman - I really need help with names here! 
) - acts like Zouaves and dresses similarly too.
Infinite tech that sends diamond mine prospectus wagons.
Tech that allows infantry to slowly gather coin from mines.
There are many more possibilities to add more consulate options to other European civilizations, particularly the Spanish, Portuguese, and Dutch, but I’ll leave it to someone more qualified to come up with historically appropriate colonial troop names and research technologies for these civs.
Please let me know yours thoughts - if popular might make this as a mod 