Isolation & Cultural Diffusion
Japan was an isolated country that was surrounded by water. On the other side of the water, Japan was surrounded by Korea, China, and Russia. These foreign countries traded ideas and those ideas had helped in the development of Japan. Without these ideas, it would be harder for Japan to keep peace between countries and make progress. It would make it so Japan wouldn't have traded as much and, without trade they wouldn't get the resources that they needed. Many Japanese ideas such as literature and writing were influenced by other countries such as China.