On This Day in History
May 31
South Sudan Peace Agreement Signed in Khartoum
South Sudan’s warring factions signed a peace agreement in Khartoum aimed at ending five years of civil war that had caused immense humanitarian crises and displacement.
International Criminal Court Rules War Rape a Crime Against Humanity
The International Criminal Court ruled that rape and sexual violence committed during war can constitute crimes against humanity and war crimes, setting a legal precedent for global human rights law.
East Timor Declares Independence from Indonesia
Following decades of conflict and international negotiations, East Timor officially declared its full independence from Indonesian rule, becoming one of the newest sovereign nations of the 21st century.
South Africa Holds First Multiracial Presidential Inauguration for Nelson Mandela
Nelson Mandela was formally inaugurated as President of South Africa in a historic ceremony symbolizing the end of apartheid. It marked the beginning of a new era of democracy and reconciliation in the country.
World Health Organization Removes Homosexuality from Mental Illness List
The World Health Organization officially removed homosexuality from its list of mental illnesses in the ICD. The decision marked a major milestone in global LGBTQ+ rights and medical recognition.
World No Tobacco Day Observed for the First Time
The World Health Organization launched the first World No Tobacco Day to raise awareness about the dangers of tobacco use and promote effective policies to reduce smoking worldwide.
World's First Earthquake Early Warning System Tested in Japan
Japan conducted the first public test of an earthquake early warning system, pioneering technology that would later save countless lives in earthquake-prone regions worldwide.
Adolf Eichmann Executed in Israel for Holocaust Crimes
Nazi war criminal Adolf Eichmann was executed in Israel after being convicted of crimes against humanity for orchestrating mass deportations of Jews during the Holocaust. His trial was a landmark in post-WWII justice.
Laurel and Hardy Film ‘The Music Box’ Released
Laurel and Hardy’s short film ‘The Music Box’ premiered and became a comedy classic. It won the first Academy Award for Live Action Short Film (Comedy) and is preserved in the U.S. National Film Registry.
Battle of Jutland Begins — Largest Naval Battle of World War I
The Battle of Jutland, the largest naval engagement of World War I between the British Royal Navy and German Imperial Navy, began in the North Sea. Though tactically inconclusive, it maintained British naval dominance.
Trans-Siberian Railway Completed to Vladivostok
The Trans-Siberian Railway was completed to Vladivostok, fully connecting European Russia to the Pacific Ocean. It became one of the longest railway lines in the world and transformed trade and mobility across Asia.
The RMS Titanic Launched from Shipyard
The RMS Titanic was launched from the Harland and Wolff shipyard in Belfast, beginning its journey toward becoming one of the most famous ships in maritime history before its tragic sinking in 1912.
Union of South Africa Formed as a British Dominion
The Union of South Africa was established, uniting four British colonies into one dominion under the British Empire. It laid the groundwork for the modern South African state.
Oklahoma Admitted as the 46th U.S. State
Oklahoma was admitted into the United States as the 46th state, marking the integration of Indian Territory and Oklahoma Territory and expanding federal presence in the American Southwest.
Great Flood of 1889 Devastates Johnstown, Pennsylvania
A dam collapse triggered a massive flood that destroyed much of Johnstown, Pennsylvania, killing over 2,200 people. It remains one of the deadliest disasters in U.S. history and led to major engineering reforms.
First Daily Weather Map Published by the British Meteorological Office
The British Meteorological Office issued the first daily weather map for public use, marking a major advancement in meteorology and public communication of scientific data.
Big Ben Chimes for the First Time in London
London's iconic clock tower bell, Big Ben, rang for the first time, marking the completion of one of the most recognizable landmarks in the United Kingdom and a global symbol of timekeeping and heritage.
Elizabeth Blackwell Becomes First Woman Listed on UK Medical Register
Elizabeth Blackwell, the first woman to receive a medical degree in the U.S., became the first female physician listed on the UK Medical Register, paving the way for women in British medicine.
Walt Whitman’s 'Leaves of Grass' First Published
Walt Whitman published the first edition of his seminal poetry collection 'Leaves of Grass'. The book revolutionized American literature and became a cornerstone of modern poetic expression.
White House Cornerstone Laid by President John Adams
President John Adams laid the cornerstone of the White House in Washington, D.C., beginning construction of what would become the official residence of the President of the United States.