Wikipedia:Selected anniversaries/December 18
December 18: Republic Day in Niger (1958)
- 218 BC - Second Punic War: Hannibal Barca (pictured) had his first great victory over the Roman Republic at the Battle of the Trebia.
- 1865 - Slavery in the United States was abolished when the Thirteenth Amendment to the Constitution was adopted.
- 1961 - Indonesia invaded Dutch New Guinea to annex West Papua on New Guinea.
- 1966 - Epimetheus, one of Saturn's natural satellites, was discovered, but was mistaken as Janus. It took 12 years to determine that they are two distinct objects sharing the same orbit.
- 1987 - The first version of the programming language Perl was released by Larry Wall.
Recent days: December 17 – December 16 – December 15
More anniversaries: