Japan has many mountains, thus, the outsiders could not easily enter Japan and Japanese could not leave the country. And, thus the self-isolation was helped by the presence of a mountain terrain. This policy was implemented by Togukawa, who insisted on preventing Japan from foreigners.
Cloth and spices brought back by the crusaders led to greater interest in trade.
North and West. USA and Russia. Let me know if that's correct.
the British were cornered with the us army and french army on land blocking any path of escape and the french navy cutting of their escape routes by sea