At the end of 21 century, mankind has stopped in development and over the next few centuries, there was no significant discoveries. This period can be compared with the Middle Ages, but not all stand on a place. Creating artificial intelligence in England gave the country an unprecedented before scientific breakthrough.
Property of one of the substances from the ocean floor was one of the first inventions of AI. Under electricity impact it halt in space.
This invention allowed to begin colonization of airspace. Royal port city was the first settlement.