The United Sol Republics (USR), also called the United Republics, is a Soros-class civilization located within D-3c1. It was founded by Askell Porceer in 8/13/23 during his term as UN Chancellor, ascending the human civilisation to a Mirian-class state.

The USR is the most powerful civilisation within D-3c1, position it has maintained since the Sol-Kirian War of 9/11/32. The USR has since utilised its military power to take strategic control over systems outside its immediate area of influence, some of which are claimed by other civilisations. Additionally, any unclassified civilisation encountered by the USR is placed in a stagnation program, or rather, completely annihilated if it represents a potential threat to the integrity of the union.