1240 Mongols under Batu Khan occupy and destroy Kiev; out of 50,000 people in the city only 2,000 survive 1865 13th Amendment of the United States Constitution is ratified, abolishing slavery 1921 Anglo-Irish Treaty signed; Ireland receives dominion status; partition creates Northern Ireland 1998 Hugo Chávez is elected President of Venezuela 2006 NASA reveals photographs taken by Mars Global Surveyor suggesting the presence of liquid water on Mars | 
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