Titan (Moon)

Summary
Titan is a large colonly established by Mars in the mid 23rd century as a source for fuel. Titan is covered in many large oceans of methane, and is responsible for most of the fuel used by Martian Republics. Since it's initial colonization, Titan's population has grown from just workers in refineries to hosting over 14 million citizens.

History
Following Martian independence in 2163, Mars could no longer rely on Earth for fuel. To combat this, the Martian government established the Titan Colonization Committee. After sending multiple landers and orbital craft to scout the moon, they eventually sent a large team to the surface to live as test subjects for multiple months.

After multiple months of testing, scanning, and planning. The committee eventually sent multiple craft filled with supplies to build sealed, pod-like structures to be built on the surface to act as homes for workers. Many refineries were built along Kraken mare, which lead to Titan eventually becoming the sole fuel source for the Martian Republics.

After decades of settlement on Titan, reproduction skyrocketed at an alarming rate, which increased demands for pod structures and more settlements on the moon. The committee eventually set up a small government on the moon and divided it up into administrative districts. This allowed many more settlements to be built in other parts of the moon. In the century that followed, Titan's population grew to over a billion citizens, and, with the deadly atmosphere being mostly neutralized, many larger settlements have been formed, which host large manufacturing plants. The moon holds an influential part in the Martian economy and government. With the planet being home to some of the richest people in the Martian Republics.