1500: Pedro Álvares Cabral is the first European to discover Brazil, landing near Monte Pascoal and claiming it for Portugal

1915: First military use of poison gas occurs when Germany uses chlorine gas against the Allies along the Western Front at Ypres, France in World War I [1]

1993: Holocaust Memorial Museum dedicated in Washington, D.C.

1994: 7,000 Tutsi are slaughtered by Hutus in the stadium at Kibuye, Rwanda

2006: Nepalese security forces open fire on pro-democracy protesters demonstrating against King Gyanendra, injuring hundreds. The protesters secure the restoration of parliament and a federal state

2016: Paris Agreement on climate change is signed in New York, binding 195 nations to limit the increase in the global average temperature to less than 2°C above pre-industrial levels and to pursue efforts to limit the increase to 1.5°C

Source: Onthisday.com