- Jun 2 Donati Comet 1st seen named after its discoverer
A House Divided Against Itself Cannot Stand
Jun 16 Abraham Lincoln says "A house divided against itself cannot stand" accepting Illinois Republican Party's nomination for the Senate
Chess Prodigy in Europe
Jun 21 Louisiana chess prodigy Paul Morphy arrives in Europe
- Jun 29 Great fire in London docks
- Jun 29 Treaty of Algun: China cedes north bank of Amur River to Russia
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