The United Kingdom of Great Britain and Ireland
Leader: George III
UA: Glory in the Name of Britain: Gain Golden Age points whenever a Citizen is born or a Land Unit kills an enemy Unit. During Golden Ages, Building and Unit Production is increased by 50%.
UU: Greenjackets: Gatling Gun replacement (Skirmisher with Enlightenment Era). During Golden Ages, gains +1 Movement and may move after attacking. Has more Combat Strength while outside of Friendly Territory.
UB: Spinning Mule: Windmill replacement. Unlike the Windmill, the Spinning Mule can be built anywhere, and it grants +1 Gold on Sheep, Cotton and Silk, doubled if the City is on a River. In addition, the Spinning Mule increases Food kept after a Citizen is born by 1% for each Farm, Plantation and Pasture worked, up to a maximum of 20%. 5 Spinning Mules can be used to unlock an Ideology.
The finalized design for George III, by the way. The Greenjackets were changed after some deliberation to Skirmishers/Gatling Guns thanks to them being the archetypal Skirmishers - mobile, trained in thinking for themselves, making use of natural cover and camouflage, moving quickly and swiftly, firing harassing shots with precision. Hell, that's why they have their green jackets.
That's why they became harassment units that can quickly enter and evade combat rather than Riflemen/Line Infantry - they're not those, really.