The Sirian Empire, centred in the Sirius star system, has advanced technology that made their citizens effectively immortal (barring accidents) and sophisticated machines that did almost everything for them. But this technology came at a price: many Sirians became afflicted with "the existentials", a debilitating malady that left them feeling worthless and with no reason to exist. To overcome this problem and give its people "something to do", Sirius embarked on a conquest of space and colonised many planets. But they also encroached on territory of the superior Canopean Empire that led to a costly war, which Canopus won. As a gesture of reconciliation, Canopus returned all the captured Sirian territory and invited Sirius to jointly colonise a new and promising planet called Rohanda (an allegorical Earth). Canopus took the northern continents and gave Sirius the southern continents.

From Wikipedia, the free encyclopedia: https://en.wikipedia.org/wiki/The_Sirian_Experiments