The most crucial reason the two traditional empires located at the eastern and western ends of the World Island could form an alliance is to jointly challenge the traditional Great Powers, overthrow the old world order established to maintain the interests of the traditional Great Powers, and establish an international order that benefits themselves.
Simply put, it's to replace the traditional Great Powers.
But the problem is, at any given time, there is only one global hegemon.
During the era when traditional Great Powers dominated, the global hegemon was the Bulan Kingdom; the Locke Republic and other Great Powers all recognized and accepted the hegemonic status of the Bulan Kingdom.
So, after defeating these traditional Great Powers like the Bulan Kingdom and the Locke Republic, the Liangxia Empire and the Tiaoman Empire would go their separate ways.
At that time, if one could establish good relations with the Bulan Kingdom, they could seize the diplomatic initiative.
