At the time when "Currents" takes place, Trantor controls about half of the worlds in the Galaxy, while the other half is divided into innumerable independent worlds and miniature empires – which naturally makes a Trantorian Ambassador a person of great consequence on any of the still-independent worlds. Later on, conquest of the entire galaxy made the Galactic Empire, with Trantor as its capital planet, a reality; the planet no longer sending out ambassadors, but only royal governors to subject worlds. This situation had already existed for thousands of years at the time of "Pebble in the Sky", the next chronological book on this timeline.