The first wagon train arrived in California after having left Independence, Missouri, in May 1841.
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462 non-violent inmates were released from Oklahoma prisons in the largest commutation in American history.
The Paris Climate Change Agreement went into force.
After a second siege, Joan of Arc liberated the town of Saint-Pierre-le-Moûtier, France.
A British-led team of archaeologists located the entrance to Tutankhamun's tomb.
Physicists in New Zealand observed a record-breaking solar flair.
