World Tuberculosis Day
1860 – Rōnin samurai of the Mito Domain assassinated Japanese Chief Minister Ii Naosuke, upset with his role in the opening of Japan to foreign powers.
1882 – German physician Robert Koch announced the discovery of Mycobacterium tuberculosis, a bacterium that causes tuberculosis.
1934 – The Tydings–McDuffie Act came into effect, which provided for self-government of the Philippines and for Filipino independence from the United States after a period of ten years.
1989 – The tanker Exxon Valdez (pictured) spilled 10.8 million US gallons (260,000 bbl; 41,000 m3) of oil into Prince William Sound, Alaska, causing one of the most devastating man-made environmental disasters at sea.
2008 – The Bhutan Peace and Prosperity Party, led by Jigme Thinley, won 45 out of 47 seats in the National Assembly of Bhutan in the country's first-ever general election.