Emperor Meiji in the context of "Sphere of influence"

The Boshin War (戊辰戦争, Boshin Sensō), sometimes known as the Japanese Revolution or Japanese Civil War, was a civil war in Japan fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and a coalition seeking to seize political power in the name of the Imperial Court.

The war stemmed from dissatisfaction among many nobles and young samurai with the shogunate's handling of foreigners following the opening of Japan during the prior decade. Increasing Western influence in the economy led to a decline similar to that of other Asian countries at the time. An alliance of western samurai, particularly the domains of Chōshū, Satsuma, and Tosa, and court officials secured control of the Imperial Court and influenced the young Emperor Meiji. Tokugawa Yoshinobu, the sitting shōgun, realizing the futility of his situation, abdicated and handed over political power to the emperor. Yoshinobu had hoped that by doing this the House of Tokugawa could be preserved and participate in the future government.

The Meiji Restoration (明治維新, Meiji Ishin; Japanese pronunciation: [mei.(d)ʑi iꜜ.ɕiɴ, meː-]), referred to at the time as the Honorable Restoration (御維新／御一新, Goi(s)shin), also known as the Meiji Renovation, Revolution, Regeneration, Reform, or Renewal, was a political event that restored imperial rule to Japan in 1868 under Emperor Meiji. Although there were ruling emperors before the Meiji Restoration, the events restored practical power to, and consolidated the political system under, the Emperor of Japan. The Restoration led to enormous changes in Japan's political and social structure and spanned both the late Edo period (often called the Bakumatsu) and the beginning of the Meiji era, during which time Japan rapidly industrialised and adopted Western ideas, production methods and technology.

The origins of the Restoration lay in economic and political difficulties faced by the Tokugawa shogunate. These problems were compounded by the encroachment of foreign powers in the region which challenged the Tokugawa policy of sakoku, specifically the arrival of the Perry Expedition under orders from United States president Millard Fillmore. Under subsequent unequal treaties, Japan was forced to open to the West, questioning the shōgun's political authority over maintaining Japanese sovereignty. The Emperor's rebuke of shogunal actions led to the emergence of an ideological divide within the samurai class concerned with their feudal obligations to both the shōgun and the Emperor. Many lower and middle-ranking samurai became shishi ("men of spirit") who were committed to the Emperor's proclamations to expel the barbarians. Factional disputes within the domains led some domains to conflict with the Tokugawa. After some initial setbacks, the domains organised into an anti-Tokugawa alliance, and, led by Satsuma and Chōshū, they overthrew the shogunal system.

Yasukuni Shrine (Japanese: 靖国神社 or 靖國神社, Hepburn: Yasukuni Jinja; lit. 'Peaceful Country Shrine') is a Shinto shrine located in Chiyoda, Tokyo. It was founded by Emperor Meiji in June 1869 and commemorates those who died in service of Japan, from the Boshin War of 1868–1869, to the two Sino-Japanese Wars, 1894–1895 and 1937–1945 respectively, and the First Indochina War of 1946–1954. The shrine's purpose has been expanded over the years to include those who died in the wars involving Japan spanning from the entire Meiji and Taishō periods, and the earlier part of the Shōwa period.

The shrine lists the names, origins, birthdates and places of death of 2,466,532 people. Among those are 1,066 convicted war criminals from the Pacific War, twelve of whom were charged with Class A crimes (the planning, preparation, initiation, or waging of the war). Eleven were convicted on those charges, with the twelfth found not guilty on all such charges, though he was found guilty of Class B war crimes. The names of two more men charged with Class A war crimes are on the list, but both died before they could be sentenced (one died during trial and one before trial), so they were never convicted.

The Meiji era (明治時代, Meiji jidai) was an era of Japanese history that extended from October 23, 1868, to July 30, 1912. The Meiji era was the first half of the Empire of Japan, when the Japanese people moved from being an isolated feudal society at risk of colonization by Western powers to the new paradigm of a modern, industrialized nation state and emergent great power, influenced by Western scientific, technological, philosophical, political, legal, and aesthetic ideas. As a result of such wholesale adoption of radically different ideas, the changes to Japan were profound, and affected its social structure, internal politics, economy, military, and foreign relations. The period corresponded to the reign of Emperor Meiji. It was preceded by the Keiō era and was succeeded by the Taishō era, upon the accession of Emperor Taishō.

The rapid modernization during the Meiji era was not without its opponents, as the rapid changes to society caused many disaffected traditionalists from the former samurai class to rebel against the Meiji government during the 1870s, most famously Saigō Takamori, who led the Satsuma Rebellion. However, there were also former samurai who remained loyal while serving in the Meiji government, such as Itō Hirobumi and Itagaki Taisuke.

The Kazoku (華族, "Magnificent/Exalted lineage"; IPA: [ka̠zo̞kɯ̟]) was the hereditary peerage of the Empire of Japan, which existed between 1869 and 1947. It was formed by merging the feudal lords (daimyō) and court nobles (kuge) into one system modelled after the British peerage. Distinguished military officers, politicians, and scholars were occasionally ennobled as (新華族, shin kazoku, 'the newly ennobled'), until the country's defeat in the Second World War in 1945. The system was abolished with the 1947 constitution, which prohibited any form of aristocracy under it, but kazoku descendants still form the core of the traditional upper class in the country's society, distinct from the nouveau riche.

Kazoku (華族) should not be confused with kazoku (家族), which is pronounced the same in Japanese, but written with different characters, meaning "immediate family" (as in the film Kazoku above).