Jovian Union

The Jovian Union, officially the Jovian Union of the Galilean Duchies of Ganymede, Callisto and Europa - colloquially known as Jupiter - was a confederation of subnational monarchies that controlled three of the four Galilean moons of Jupiter in the late-2100's and 2200's into the present day. At over 190.5 million square kilometers of claimed and controlled territory, the Jovian Union was the territorially-largest nation state in human and transhuman history (although their internationally-recognized territory was closer to just over 2.1 million sq. km). The colonies of Galileo, Suisei and Freja on Ganymede, Callisto and Europa respectively were first colonized in the early-to-mid-2100's as subordinate duchies of the Monarchies of Norway, Japan and Sweden. As Jovians were fundamentally transhuman - a different species of human entirely - the drive for independence would begin in its earliest years of colonization and continue to steadily increase throughout the 2100's, until the Jovians saw their first opportunity to launch an attempt at independence from Earth's nations - the rise of the International State in the 2160's.
At 97.1% transhuman Jovian, the Jovian Union was a demographically homogenous system-state more akin to the Martian Axis, Neptune-Uranus or Venus than Luna with just under 9% of its own population being non-human, or Saturn's total human population of just over half at 51% (12.29% AI and 38.7% transhuman Jovians and Mir). The total Jovian populace sat at just over 2.1 million, or almost twenty times larger than the Mir, whom they shared space with around Saturn, Uranus and Neptune. At a population of around 129,780, the Mir were the smallest and most widely-spread demographic of transhumans, and were thus wary of Jovian and AI supremacists from Ganymede and Titan. Indeed, their suspicions were well-placed, as ever since the first teams of Norwegian and Japanese scientists gave birth to the Eu (Sanus cogitabat) - artificially gene-boosted organisms derived from single-cellular slime molds found beneath the ices of Europa - the general Jovian populace would grow to resent, fear and hate the Eu, despite their place in society. Many would emigrate to Luna as a result. As non-human and a form of artificial intelligence, the Eu would face the same form of robophobia and xenophobic ecofascism that tainted Scandinavian history in the post-moratorium era and thereafter, as much of that discrimination would carry over from the Earthling countries onto their Jovian offspring in the 2140's and continue for decades.
In 2167 and 2168, the Jovian system-state was established and independence was declared, although it would take another 3 years for their independence to be recognized from Scandinavia and Japan, and thus the International State and Asia-Pacific. During this time and from then on, the Jovian Union would establish relations with the International State in defiance of the E-Six, primarily to cosmopolitically position itself as a separate political entity from Earth, and a political and economic alternative to Earth and CATO for the United Saturnine Republics, Neptune and Uranus. With their own small fleet of 6 starships, the Jovian Union was a regional power along with Titan in the Outer Worlds, and the two often competed for influence over USR worlds. At around 6'10-8' and 280-350 pounds average for males, 6'06-7'06 and 170-240 pounds for females, Jovians were almost always larger, stronger, faster and lived longer than cishuman Earthlings. Genetically engineered and bred to live and work in the Jovian moon system, the original 250,000 Ganymedeans and their offspring would go on to become a breakaway civilization of superhumans and due to their natural physical superiority to cishumans, would represent a demographic naturally inclined toward supremacist and speciesist ideologies.