This is a list of selected December 18 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
Please note:
- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
- An event is generally excluded if it is already the subject of the scheduled featured article, featured list or picture of the day.
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Ineligible
| Blurb | Reason |
|---|---|
| 218 BC – The Carthaginian forces of Hannibal defeated the Roman Republic at the Battle of the Trebia, the first major battle of the Second Punic War, along the Trebbia River in present-day Italy. | Need to verify date |
| 1271 – Mongol ruler Kublai Khan established the Yuan Dynasty in present-day Mongolia and China. | {{cleanup}} |
| 1916 – The French defeated German forces around the city of Verdun-sur-Meuse in northeast France, ending the longest battle and one of the bloodiest in World War I. | needs more footnotes |
| 1932 – Playing indoors at Chicago Stadium in Chicago on a modified American football field, the Chicago Bears defeated the Portsmouth Spartans, 9–0, in the first ever playoff game held by the National Football League. | {{refimprove}} |
| 1990 – The Migrant Workers Convention was signed at the United Nations enhancing the protection for migrant workers. | {{refimprove}} |
Eligible
- 1958 – The United States launched SCORE, the world's first communications satellite.
- 1966 – Epimetheus, one of the moons of Saturn, was discovered, but was mistaken as Janus. It took 12 years to determine that they are two distinct objects sharing the same orbit.
- 1996 – The school board of Oakland, California, passed a controversial resolution officially declaring African American Vernacular English as a separate language or dialect.
- 2009 – The Copenhagen Summit on climate change ended with the drafting of the non-binding Copenhagen Accord.
December 18: Republic Day in Niger (1958); National Day in Qatar (1878)
- 1892 – The first performance of the fairy tale-ballet The Nutcracker was held at the Mariinsky Theatre in Saint Petersburg, Russia.
- 1912 – Amateur archaeologist Charles Dawson announced the discovery of fossilised remains of a previously unknown early human, known as Piltdown Man, which later turned out to be a hoax.
- 1972 – Vietnam War: The United States began Operation Linebacker II against North Vietnam, the largest heavy bomber strikes launched by the U.S. Air Force since the end of World War II.
- 1987 – Programmer Larry Wall released the first version of the programming language Perl via the comp.sources.misc newsgroup.
- 2006 – The first of a series of floods (pictured) struck Malaysia, which would eventually kill 118 people and leave over 400,000 others homeless.
More anniversaries: