RPC54 - The Expanse
Exploration of the solar system came and went. Barriers to interstellar travel prevent going beyond our star and so Humanity has spread throughout the system, colonizing Mars and building large stations in The Belt and beyond.
It has been 180 years since the first colonies on Mars and 150 since the Epstein Drive made it feasible to begin colonizing large swaths of the solar system. Since that time political powers have shifted drastically with Earth unifying to directly compete with Mars on the open market, both exploiting the Belters as a source of cheap labor. This intense competition between Mars and Earth has created a rivalry that The Belters are caught in the middle of.