The Inland region's discovered some mines, gathering metal and developing ways of smelting and using them; later on, they would create powerful tools mixing magic and machines; this made the Coast Region aware that they were falling behind in research and development.
After a while, the region of Medine started to export raw materials to other countries. The Queen of Sidone, who only sold some of the overall produced nourishment to Medine, noticed that Medine's relationship with some countries also included reselling what they were buying from them. Which escalated the relationship between both regions.
The most tense event from this period occurred when a party of Medine's Army tried getting some steel to Sidone's port, where a ship from another country was waiting. The Queen of Sidone retained this party for a time; she wouldn't allow this to happen without some competition for the crown.
