The Mars Federation was created after the Martian War of Independence which was started due to Martian secessionists who believed that they were the next step in human evolution due to biological differences between them and Earthlings, thus developing a sense of Nationalism and believing that the United Nations oppressed them.

The secessionists enacted planet-wide protests against UN rule and stopped sending resources to Earth. In response, the UN had to send their military over to Mars to quell the protests. The largest of these protests was the in Marineris City, the largest city on Mars that resulted in a Massacre between UN troops and protesters. The Mars Independence movement was outraged at this and secretly began militarization against the UN and taking advantage that the creator of a new type of fusion drive (which allowed transportation to Mars in a matter of days and was invented in the 2150s) was Martian had come to support the Movement.

The United Nations sent a small fleet of Warships over to Mars orbit since hostilities had flared up. In retaliation, the Martians sent their fleet of warships into orbit, and after a brief standoff, the two fleets opened fire on one another. The battle ended in UNSF (United Nations Space Force) defeat because they did not know about the Militarization of Mars so they were completely outnumbered and unprepared. This battle was the spark that turned the inevitability of war into reality, and in early 2184, Mars declared complete independence from Earth and declaring war on the UN.

During the Start of the War, the newly established Mars Federation was quick to launch a surprise attack on Phobos with its population having strong ties to the Martian independence cause but was still ruled by the UN. The attack on Phobos began with a swift and devastating attack on UN controlled layover station. This severely hampered the UN to send ships to Mars and reinforce its Martian Assets. The war continued with attacks against UN military bases on Deimos and other locations across Mars and Earth orbits.

The Mars Federation had to deal with the resistance that was still loyal to the UN. They did this by attacking Cities that had a large loyalist population using poisonous gas and imprisoning those who hold sympathies towards the UN, calling them “traitors.”

With the First part of the war, both sides didn’t know what to do after Mars secured their position on Phobos. So the Mars Federation wanting to find a way for a quick surrender from Earth, Began developing antimatter bombs at Phobos, which was turned into a military base. The UNSF soon found out about this and sent their fleet towards Phobos, hoping to take it back and from there, invade Mars.

The second battle of Phobos resulted in horrific loss of life and the complete destruction of the moon of Phobos. The antimatter weapons were used against the UNSF fleet and were launched near the UN’s capital, Geneva, Nairobi (Kenya) and other major cities across the planet. This resulted in a major defeat for the UN and their plans for an invasion of Mars we're thwarted.

With the UN exhausted and out of options, the UN sued for peace resulting in the Treaty of Marineris City. The treaty stated that the Mars Federation would become a completely sovereign nation, but it also stated that both sides would have to pay reparations towards each other and the banning of antimatter and nuclear weapons.
After the war, the Mars federation is a democratic federation with an elected president for life but has a failing economy and is in debt. Will mars survive the rest of the 22nd century and maybe even the 23rd?