User blog comment:KrusH HsurK/Earth, Capital of humanity, but lacking of its own capital?/@comment-4310096-20120508211244

Khar'Shan, Thessia and Earth, don't have Capitals, all those planets are said to be more or less divided into nation-states, with Thessia having ancient-greece/italy/middle-ages germany city states, Earth being much like today (Russia, China, India, the EU and the UNAS were mentioned) and Khar 'Shan even having internal conflicts between various states (info from Shadow Broker transactiones).

BTW: In 2185, Canada doesn't exist as an independent country anymore. In 2092, it merged with the US and Mexico into the aforementioned United North American States, covering all of North America (Duh). Much like it's been alluded to the European Union having become a Federation (basically one country, consisting of smaller ones)