Editing 1866 (section)

=== Date unknown ===
* [[Federalist]] revolts occur in [[Argentina]].
* [[Alfred Nobel]] invents [[dynamite]] in Germany.
* Foundation of the predecessors of [[Nestlé]] S.A., the Anglo-Swiss Milk Company and Farine Lactée Henri Nestlé.
* The Minneapolis Milling Company, predecessor of [[General Mills]], builds its own mills.
* [[Marcus Jastrow]] arrives in the United States to become rabbi of Congregation Rodeph Shalom in [[Philadelphia]].
* The recommendations of the state [[Girls' School Committee of 1866]] result in a series of progressive reforms in women's rights in Sweden.
* The [[Famine of 1866–68]] begins in Finland.
* Erasmus Jacobs discovers the {{convert|21.25|carat|g|adj=on}} [[Eureka Diamond]] near [[Hopetown]] on the banks of the [[Orange River]] in the [[Cape of Good Hope]].
* [[Magirus|Magirus Kommamditist]], as predecessor of a major worldwide [[Vehicle|commercial vehicles manufacturing brand]], [[Iveco]], is founded in [[Baden-Württemberg]], [[Germany]].{{citation needed|date=September 2021}}