1850: Robert McClure sights the fabled Northwest Passage for the first time (from Banks Island towards Melville Island)

1861: Pony Express (Missouri to California) ends after 19 months

1863: International conference begins in Geneva aimed at improving medical conditions on battlefields – beginning of the Red Cross
1977: Last natural case of smallpox discovered in Merca district, Somalia. Considered the anniversary of the eradication of smallpox, the most spectacular success of vaccination
2019: Raid by US Special Forces kills ISIS founder Abu Bakr al-Baghdadi in Syria

Source: Onthisday.com