Lunar United Nations

Luna, officially the Lunar United Nations - L.U.N., is an intergovernmental political, security and economic alliance of city-states established in the late-2090's that laid claim to the entirety of the Moon's surface area and Selene Station. Consisting of Japan, Korea, the American States, France until 2162, Canada until 2165 and Britain officially until 2189 and unofficially since then, the Lunar United Nations currently controls 21 city-states and 64.5% of the Moon's total population - including its two largest settlements and its cultural capital of Armstrong City - and laid claim to the total 37.9 million square kilometers of the Lunar surface area and the entirety of its grand total of 11.4 million in population. Due to the Moon's special relationship with the Earth Seven, the Moon had access to the entirety of the E7's 44 military starships, and thus had access to a spacefaring military force and power projection four times the size of Mars's and over twice the size of the International State's (when taking the E7–LUN system as one singular whole) at the turn of a screw.
Earth's Moon was home to the largest population of Eu at around 28,706 or 56% of the population, the other 43% and 1% living among the moons of Jupiter and Saturn respectively, and the second-largest population of Jovians and AI outside of Ganymede and Earth at 264,250 and 368,000 respectively, surpassed only by Ganymede and Earth at 896,000 Jovians and over 100-150 million AI respectively. By the 2200s the Martians themselves were considered a transhuman separate species from Earthling and Lunar homo sapiens, but unlike the practically-superhuman Jovians could not survive in Earthling and Lunar environments. As a result, the Martian society became inward-facing culturally, while facing outward to the Asteroid Belt cosmopolitically. The Eu made use of AI and advanced atmospheric "hydrosphere" suits as they were native to the single-celled fungal slime mold life forms of Europa, which they also used to communicate with in conjunction with sonar-based intonations that were thought-sensitive, a result of the dolphin DNA of their gene-boosted evolution, and could reflect human languages back through the use of thought-identification technology, able to understand space and time almost like a human due to cephalopodic brain chemistry.
The largest settlements on and around the Moon are Selena (2.8 million), Armstrong (950,000) and Apollo (650,000), followed by Tycho (450,000), Ptolemy (390,000), Plato (300,000), Lunar Kepler (270,000), Copernicus (240,000), Manilius (170,000) and Poseidon (40,000) with approximately 1.1 million spread across the remaining 11 settlements controlled by the Lunar UN. By 2089, the Moon had a population of over 1,000,000 - but that would all change in the succeeding decade, as an immigration boom spearheaded by Japan, Europe and the American States under the umbrella of the United Nations would see tens of thousands emigrate to the Moon each year between 2094 and 2105, with a total of 725,000 permanently leaving the Earth behind by 2115 - 5,000 people on 25 starships a month. By 2150 the population had hit 4,500,000, with a plurality living on the Selene Orbital Habitat colloquially known as Selena - at 1.1 million by 2150 which would nearly triple over the next decades to 2.8 million by 2200. By 2150, Armstrong City was the next-largest settlement and de facto Lunar capital at over 400,000, a population which would also triple (along with every other settlement on the Moon) to nearly 1 million by 2200.
During the Eurasian takeover of three of Western Europe's 'Big Four' economies, plus Spain, Portugal, Wales, Scotland, Scandinavia and the rise of the Eastern European Federation (EEF) as an effective puppet state of the Eurasianists and Pan-Turkicists in the 2160's, Luna would be the only world-state to side with the defunct Earth Six against Internationalist claims on these territories in Europe, North America and elsewhere. The Jovians, with exuberant support from the then-Saturnine Protectorate of the E6 and Venus, and tacit support from Mars (although the Martian Axis would officially declare neutrality as a military alliance in 2186, angering the Jovian Union from then on) would spearhead an interplanetary coalition to liberate the fledgling asteroids community from Earthling–Lunar administrative oversight, a move on which the Martians would cooperate with the Jovians until 2186.