Emperor Meiji died on 1912-07-30, and Crown Prince Yoshihito became Emperor Taishō. During the Taishō era (1912–1926), party politicians and the elected Diet increasingly challenged older elite rule, helping set the stage for expanded parliamentary politics.
Mass protest and parliamentary pressure helped bring down Prime Minister Katsura Tarō’s cabinet in early 1913. The crisis showed that public mobilization and party politics could topple a government, strengthening demands for “constitutional” (party-based) cabinets.
Japan presented the Twenty-One Demands to China on 1915-01-18, seeking expanded privileges and influence. The episode increased regional tensions and fed domestic debate about the direction of Japanese diplomacy and the costs of expansionism.
From 1918-07-22 to 1918-09-21, nationwide rice riots erupted amid inflation and soaring food prices. The unrest exposed the limits of police-centered responses and intensified pressure for political and social reforms tied to broader participation in government.
After the rice riots, Prime Minister Terauchi Masatake resigned on 1918-09-21, and Hara Takashi took office soon after. Hara’s government is widely seen as a milestone because it advanced the idea that cabinets should be led by parties with strength in the elected House of Representatives.
The 1920-05-10 general election occurred after reforms that reduced the tax payment threshold for voting, increasing the electorate. Hara’s Seiyūkai won a large majority, reinforcing the connection between mass politics, elections, and cabinet leadership.
On 1921-11-04, Prime Minister Hara Takashi was fatally stabbed at Tokyo Station. His assassination highlighted growing political violence and instability even as party cabinets became more common.
The Great Kantō earthquake struck on 1923-09-01, devastating Tokyo and Yokohama and causing massive loss of life and destruction. The scale of the disaster forced government attention toward relief and reconstruction, and it deepened social strains during a period of political experimentation.
On 1923-09-02, Yamamoto Gonnohyōe formed a new cabinet as the government pivoted to disaster response and rebuilding. Reconstruction policy became a major political test: it required funding, planning, and coordination that could either strengthen or discredit party-centered governance.
The 1924-05-10 general election produced no single-party majority, leading major parties to form Japan’s first coalition government. On 1924-06-11, Katō Takaaki became prime minister, signaling that bargaining among parties in the Diet could determine who governed.
On 1925-03-29, the Diet passed the Universal Manhood Suffrage Law, expanding voting rights to nearly all men age 25 and over. This change greatly enlarged the electorate, making political parties more dependent on mass campaigning and public opinion.
On 1925-04-22, Japan enacted the Peace Preservation Law to punish groups seeking to change the kokutai (often explained as the emperor-centered national polity) or abolish private property. The law shows a central contradiction of late Taishō politics: broader voting rights expanded participation, while new security laws strengthened tools for suppressing radical dissent.
Prime Minister Katō Takaaki died on 1926-01-28, ending a key coalition-era government identified with major democratic reforms. Wakatsuki Reijirō formed a new cabinet on 1926-01-30, inheriting both the expanded electorate and the repressive legal framework created in 1925.
Emperor Taishō died on 1926-12-25, bringing the Taishō period to a close. By this point, Japan had both expanded party-centered electoral politics and built stronger state controls—an outcome that shaped how party government and civil liberties would develop in the early Shōwa years.
Taisho democracy and party politics in Japan (1912-1926)