We are aware that history of Japan and its military and political development was mostly land based, amassing large armies, isolating themselves from foreign influences and trade to substantial extent, despite Japan being an archipelago with long coastline, and substantial timber resources for building a fleet. And considering Japan's military exploits in Korea and China, their immediate neighbours, expansion to that direction is bound to be taxing on Japan's resources and be bogged down by foes they would not be able to overwhelm in the long term. Toyotomi Hideyoshi and Oda Nobunaga planned a conquest of China, with Korea serving as a beachhead to further expansion. The Imjin war illustrated how flawed such plans were. We have a counterpart of Japan, in England as the island nation engaged in continental expansion and being eventually defeated, albeit under different circumstances. Later, Kingdom of England adopted more maritime and trade expansionist approach, which ultimately benefited them. Is it possible for a POD post unification by any Daimyo after Sengoku Jidai? Can Japan expand into the neighbouring island regions, conquering them or establishing outposts for trade? I know about the planned Tokugawa invasion of Phillipines as a possible vector of expansion. In my opinion Japan had opportunities and resources to become an equivalent of England in Europe but failed to do so.