In the history of the Japanese people, five dates stand out above all others. They are 66o B. 'C., when, according to legendary account, the Empire of Japan was founded .by the Emperor Jinmu; 1853, when Commodore Perry, with an American squadron, anchored offside what is now Yokohama and caused the opening of Japan to foreign intercourse; 1867-1868, when there was a restoration'of the monarchy, marking the beginning of the Meiji Era of Constitutionalism; and 1889, when the Constitution of Japan was promulgated.
George A. Malcolm,
Constitution of the Empire of Japan,
Mich. L. Rev.
Available at: https://repository.law.umich.edu/mlr/vol19/iss1/5