As for the history of this continent, Fang Zheng himself actually didn't know much, so he never expected that he could dig out such a secret from Wells.
According to the Old Paladin's account, for several hundred years prior, the development of the continent was quite in line with the "Medieval Fantasy" setting Fang Zheng had envisioned. However, it all changed with the rise of the Kadra Empire: they heralded a major leap in the civilization level of the entire continent. The Magitech Warships and Magic Energy Engines used now had actually been in their infancy during the era of the Kadra Empire. It's just that Kadra itself hadn't developed them— or perhaps it's better to say that precisely because such development required a lot of resources and manpower, Kadra chose to invade other countries.