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Countries Regions

© 2026 Timeline Library

Otto von Bismarck's minister-presidency and policies (1862–1871)

1862 - 1871

Organization of Eastern Caribbean States (OECS) development and integration (1981–present)

1981 - 2025

Oregon Treaty and American Settlement of the Oregon Country (1846–1860)

1818 - 1855

Ōnin War and the fragmentation of central authority (1467–1573)

1454 - 1573

Đông Kinh Nghĩa Thục (Tonkin Free School) and modernist reforms (1907–1908)

1887 - 1908

One Unit policy and the creation of West Pakistan (1955–1970)

1954 - 1970

One-Child Policy: Implementation to Abolition (1979–2015)

1971 - 2016

Olusegun Obasanjo civilian presidencies (1999–2007)

1999 - 2007

Okinawa Reversion to Japan and Related Negotiations (1952–1972)

1950 - 1972

Okhrana: imperial political policing and repression (1881-1917)

1881 - 1917

Ogoni struggle and the trial/execution of Ken Saro-Wiwa (1990–1995)

1990 - 1995

Offa of Mercia and Mercian ascendancy (r. 757–796)

757 - 796

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