When these territories were captured, Bowser was finally able to escape persecution in the Mushroom Kingdom and live peacefully in Africa. That way, Mario would have to travel farther if he wanted to rescue Peach. More importantly, Toad would be too lazy to travel all that way just to say "Your princess is in another castle." The Bowser UnWorld Territories still serve this purpose, though Bowser's base of operations has since moved to North Hyrule.