Due to a resource crisis and a dwindling atmosphere, United Nations ignites a massive wave of off-world colonization to resolve these issues. Most planets and moons within the Sol System are colonized.
After a year of fighting, Earth and SDF's political leaders meet on Pluto's moon, Charon, to negotiate the Charon Accords. This ultimately brings an end to the Secession Wars, whilst limiting both sides' abilities to expand further into the solar system.
SDF secures Mars's sovereignty through the Accords
SDF hijack the AATIS guns in Geneva, crippling much of the UNSA fleet. After a brief skirmish, the guns are secured back into SATO grasp and SDF sleeper-cell Riah is captured.
SATO fleet engages SDF fleet in ship-to-ship combat outside Earth's atmosphere. After destroying the attacking fleet, Olympus Mons, equipped with an F-SPAR cannon, arrives and destroys most of the SATO fleet.
SDF launches a concurrent attack on the Lunar Gateway. SATO launches Operation Port Armor and successfully retakes the port.
UNSA launches Operation Burn Water on Titan and successfully destroys the SDF's critical refueling stations.
SATO launches Operation Black Flag in an attempt to lure the SDF fleet into the AATIS array. SDF manages to destroy the guns first, allowing the fleet to attack Earth with little resistance. SATO responds by hijacking the Olympus Mons, killing Admiral Salen Kotch and using its weapons to force SDF to retreat.
SATO launches Operation Blood Storm in an attempt to cripple the SDF war effort by attacking Tharsis Shipyard. Despite heavy losses, including the ships Retribution and Olympus Mons, swell as most of their crews, Tharisis Shipyard is destroyed, along with much of the SDF fleet.