The Imperium Mundi of Terran Commonwealth is a massive, environmentally stunning nation, ruled by Elizabeth IV Imperatrix with an even hand, and notable for its infamous sell-swords and pith helmet sales. The compassionate, hard-working population of 2.335 billion Terrans enjoy extensive civil freedoms, particularly in social issues, while business tends to be more regulated.

The medium-sized government juggles the competing demands of Defense, Administration, and Education. It meets to discuss matters of state in the capital city of London. The average income tax rate is 21.4%.

The strong Terran economy, worth 132 trillion sovereigns a year, is fairly diversified and led by the Tourism industry, with significant contributions from Cheese Exports, Furniture Restoration, and Retail. Average income is 56,832 sovereigns, and evenly distributed, with the richest citizens earning only 4.8 times as much as the poorest.

TV coverage of music festivals consists mostly of backstage interviews, when their backs are against the walls Terrans look out for gay men, fifteen-year-olds cannot walk younger siblings to school without a professional Childcare and Education Certificate, and conspiracy theorists allege that the government is spying on them through their carbon monoxide detectors. Crime is almost non-existent. Terran Commonwealth's national animal is the lion, which frolics freely in the nation's many lush forests, and its national religion is Anglicanism.

Terran Commonwealth is ranked 165,335^th in the world and 7,316^th in Lazarus for Most Scientifically Advanced, scoring 58.74 on the Kurzweil Singularity Index.