The Tokugawa period was the golden age of Japan that showed strong artistic, economic growth and lived a great period of peace for more than two centuries. This was such a promising time for Japan that it marked Japanese culture immensely, which is the main reason why there are so many different representations of that time.
At that time, Japan adopted an isolationist policy, which allowed that all artistic and cultural creation did not have the interference of foreign concepts, revealing the pure essence of Japanese culture.
The Demilitarized Zone between North and South Korea was created in a. 1953. It established the end of the Korean War and it crosses the 38th parallel (but is not completely on it).