The Belt was colonized by humans roughly 400 years ago. The humans who are born in the Belt, called Belters, are taller and thinner than humans from the Inner Planets Earth and Mars due to the lower gravity.
While the population of the Belt is around 50 million according to official inner planet censuses, other sources such as the OPA claim it’s nearer to 100 million.
Due to its rich mining, The Belt is THE major battleground of contention between Earth, Mars and the Outer Planets. It is the largest source of minable raw materials and rare elements in the Sol System.
Each Faction has a presence in the Astroid Field.