The term used to describe when Japan went through a period of isolation is known as O Katipunan
O Sakoku
Sengoku-Jidai
O Pax Romana

Sakoku

Asia-Pacific | Japan. While Sakoku, Japan's long period of isolation from 1639 to 1853, kept it closed off from much of the world, one upshot was the rise of cultural touchstones that persist to this day.

c) he felt the constitution clearly gave states this right.