Heian Era: peaceful and encouraged art.
Shogunate Era: violent, unstable and
supported inequality among social classes.
Answer:
The only one I know as a Declonized country is South Korea(1945/1948)
North Korea (1945/1948)
Also India 1947
The Constitution provides that an amendment may be proposed either by the Congress with a two thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two thirds of the State legislatures.