The actions of player organizations can impact these relationships, moving polities that are at open war with each other to tenuous peace, and polities in friendly competition to open war. The below conflicts, however, have been long simmering, and absent consistent efforts on the part of player organizations, the rivalries will tend to re-emerge.
The Martian Civil War
The dominant polity of the Mars Republic was essentially run as a de facto corporate entity for the early decades of its existence, with different Earth-based polities holding shares as a way of keeping nominal interest while at the same time protecting Mars from interference; after all, if everybody had a piece of the Martian pie, nobody was inclined to cause trouble.
The obvious flaw with this logic lay in all the individuals who had no real representation. While workers in the original Mars Corporation all had shares of their own as a condition of their employment, these shares were non-voting Class D shares.
The inevitable result of this was labor disruptions, which led to a reformation of the Mars Corporation as the "Mars Republic", though this was little more than a change of name and official titles. What began as an insurgency in ice mines primarily in the northern polar region has since turned into a long-running civil war, with the rebellious “Free State of Mars” in the northern polar region barely maintaining itself and existing in abysmal conditions.
On the flip side of this, the Mars Republic is in a tough position; it wants to reclaim the facilities and labor of the north polar region, so is unable to use tactics that would threaten those facilities. The Mars Republic also does not have the military troops to reliably do this, and so the civil war drags on consisting mostly of Mars Republic surgical(ish) strikes on suspected purely military emplacements and periodic raids intended to take over facilities one by one.
The conflict is reminiscent of the Vietnam War in many ways; the Mars Republic is far more powerful, but there are many inside its administration that are skeptical the cost may not be worth just signing a deal. For now, pride has kept the conflict going, and the dominant factions on each side are in no mood to temporize. For the Free State of Mars, the abject conditions have generated a surge in patriotism, creating a deeply committed population that has already paid such a high price in blood that at this point any major compromise has become inconceivable.
The Galilean Conflict
The four great Galilean moons of Jupiter - Io, Europa, Ganymede, and Callisto - have long been the single greatest concentration of economic, political and military force in the solar system outside of Earth orbit.
Each of the four Galilean moons was settled by different national and corporate parties, and although all four have long since nationalized they have maintained a state of competitive distrust in the best of times and war at the worst.
The primary axis of the current conflict is between the two largest and industrially most powerful of the Galileans - the Sovereign Republic of Ganymede and the Commonwealth of Callisto. The two moons are in a state of open, brutal war, the flow of which depends very much on the relative positions of the moons as they circle Jupiter.
The Europan Consortium is nominally a national entity, but in almost every way functions as a corporate entity. Specifically, a corporate entity focusing on biological and human genetic engineering; The Europan Consortium’s gengineered janissary mercenaries are sought after by many of the polities throughout the solar system most notably including the Mars Republic, the Eastern Federation, the Sovereign Republic of Ganymede and the Alliance. As such, the Europan Consortium has tried to stay out of the general Galilean Conflict, but the Ionian Combine is frankly making this difficult.
Io is unstable not only geologically, but politically as well. Governed by a fractious collection of oligarchic families derived from the original corporate interests that settled the world, the Ionian Combine barely has what could be called a formal foreign policy.
Raids by individual families on all of the other polities of the system are common, to the point that the Europan Consortium is growing impatient and the Sovereign Republic of Ganymede has declared open war on the Ionian Combine - though this last is ineffectual since the Sovereign Republic of Ganymede is in no position to divert its attention from the Commonwealth of Callisto.
In addition to the state of open war between the Sovereign Republic of Ganymede and the Commonwealth of Callisto, and the Sovereign Republic of Ganymede and the Ionian Combine, the Commonwealth of Callisto offers bounties for raids on the Europan Consortium's interests, and the Europan Consortium does the same on the Ionian Combine interests. The Ionian Combine, for its part, is famous for hiring mercenaries and independent “contractors” in the execution of individual vendettas and “resource gathering” expeditions against other interests in the Jupiter system.
The Trans-Jovian War
Most of the conflicts throughout the solar system are intra-system between interests within the same orbit. The major exception to this lies in the invasion of Saturnian space by the Alliance, the latter based on several of the larger moons of Uranus with its capital on Oberon.
Aside from the various political interests outside the immediate concert of war, this conflict is being watched closely as an experiment in inter-orbit warfare. As no one has attempted something like this, if it proves successful there will certainly be copycats.
Saturn itself is dominated by the great Titan-Rhean coalition. While far from a state of open war with the lesser powers of Saturn, notably, the Iapetus Coalition and the Amalgamated Calpultin of Dione, there is a significant amount of resentment and covert activity directed primarily at Titan.
In the middle of this general tension came the military juggernaut of the Alliance. The Alliance has occupied a number of smaller moons in Saturn’s orbit as powerfully defended forward bases and has launched a massive political campaign to keep the Iapetus Coalition and the Amalgamated Calpultin of Dione at least neutral, if not friendly. Thus far, this political angle has been successful, with both polities currently choosing to stay neutral.
The war itself is not (yet) focused particularly on any of the major worlds, but is instead playing out as a game of chess among the various moons of Saturn as the Titan-Rhean Coalition on one side and the Alliance on the other attempt to “island hop” the various moons to strengthen their position.
The Titan-Rhean Coalition has substantial planetary defenses, but their naval forces are limited, and as a result Alliance’s own powerful navy has been slowly improving its strategic position, gobbling up more and more of the smaller moons, cordoning off Titan and Rhea and slowly moving into a position where a frontal assault might be possible.
While the initial colonization of Triton led it to being prosperous and economically vibrant, over a century into the settlement of Neptune several smaller colonies, resentful of the Democratic Republic of Triton’s power, banded together in the Protean League. With the rise of a powerful autocratic leader, the Protean League has since created a potent military machine that while not wealthy - for example, it boasts no dreadnoughts or superdreadnoughts - is nonetheless very effective against the disorganized and cynical population of the Democratic Republic of Triton.
The Protean League’s military effectiveness stems from two factors. First, the Protean League devotes a wildly disproportionate percentage of its wealth on its military. Second, the Protean League is culturally xenophobic to a degree of us-versus-them mentality that does not so much border on ruthlessness as enthusiastically leaps over the line.
The Democratic Republic of Triton itself is politically disorganized, made up as it is by fractious political parties that are hard put to agree on much of anything. Despite its wealth and power, thus, it has found itself constantly pecked at by the Protean League to the point that some are thinking the unthinkable, that the Protean League might actually eventually be able to prevail.
If the Protean League does prevail, however, it will take quite a long time, for the Protean League’s resources are relatively modest and it has very few friends in the rest of the solar system. Still, the Long War continues consisting of small scale raids and targeted attacks on civilians, ineffectual counter-raids by the Democratic Republic of Triton’s own naval forces, and occasional all-out battles as the Democratic Republic of Triton attempts to hold on to its own few remaining colonies and mining facilities in the rest of the system.
The Protean League’s only real friend, in fact, is the Kuiper Belt exile community on Haumea. Haumean partisans are frequently hired as infiltrators by the League, and incidents of out and out terrorism executed by Haumeans in the Democratic Republic of Triton’s major cities are common. The result of which has been predictable, with anti-Haumean witch hunts and even pogroms on the part of a fearful, panicked Democratic Republic of Triton populace.
The Haumean Problem
The dwarf planet of Haumea in the far extremes of the solar system represents one of the more difficult problems facing any cause of peace amidst the polities of Org.
The prison moon of Hyperion in Saturn’s orbit has long been used as a kind of Botany Bay-esque location for “resettlement” of “difficult populations” and political enemies. Every polity in Saturn’s orbit takes advantage of Hyperion to a greater or lesser degree. In some cases this is somewhat passive; the Amalgamated Calpultin of Dione allows convicted criminals the option of deportation to Hyperion rather than life in prison. For other polities this is more explicit - the Rhean Divisional Authority enthusiastically deports both individuals and groups that are exhibiting difficulty “adjusting” to "the Titan way of life".
Needless to say, conditions on Hyperion are appallingly bad; the average lifespan of a new “citizen” of Hyperion is two years, though the constant influx of deportees maintains the population with a healthy margin despite this.
Twenty years ago, a large number of exiles on Hyperion escaped with the aid of a sympathetic org based in the Kuiper Belt, establishing a refugee colony on the dwarf planet of Haumea.
Rather than creating conditions of peace and hope, however, the resulting struggle to survive on Haumea has led the Haumeans to turn outward, waging a guerrilla war on Saturn and anyone who they feel has ignored their plight, or are enemies of the few polities who have lent them support.
Their naval capabilities are non-existent, so Haumean partisans typically engage in various forms of asymmetrical warfare including commercial hijackings, kidnapping, bombs and other types of sabotage or assassination. Their major targets include Mars, the Galilean polities of Jupiter, the Alliance, and the Democratic Republic of Triton, but above all the polities of Saturn.