The Sol Trade Organisation (or STO) came into existence as the governments of Sol jockeyed for the best economic and military positions through the Solar System and beyond. Instead of investing in a military, per se, the relatively poor South American states spent money building space stations of various sizes.
Their Trade Outposts became key to the movement and exchange of goods between not only fellow Earthlings but the more cordial alien races, too. With no military to speak of, most humans declared the South American stations neutral ground and agreed a strict set of punishments to deter anyone from committing violence within or around the outposts.
Below is an example of a small outpost, circa the start of the Third Age.