Historical timeline for December 9

Fifty-five people are killed and more than 100 injured when a truck with 160 migrants from Central America overturned in Chiapas, Mexico.

A volcano on Whakaari / White Island, New Zealand, kills 22 people after it erupts.

The Marriage Amendment Bill receives royal assent and comes into effect, making Australia the 26th country to legalize same-sex marriage.

At least 57 people are killed and a further 177 injured when two schoolgirl suicide bombers attack a market area in Madagali, Adamawa, Nigeria in the Madagali suicide bombings.

President Park Geun-hye of South Korea is impeached by the country's National Assembly in response to a major political scandal.

At least seven are dead and 63 are injured following a train accident near Bintaro, Indonesia.

A plane crash in Mexico kills seven people including singer Jenni Rivera.

Governor of Illinois Rod Blagojevich is arrested by federal officials for crimes including attempting to sell the U.S. Senate seat being vacated by President-elect Barack Obama.

Space Shuttle program: Space Shuttle Discovery is launched on STS-116 carrying the P5 truss segment of the International Space Station.

A blast in the center of Moscow kills six people and wounds several more.

Gwen Jacob is acquitted of committing an indecent act, giving women the right to be topless in Ontario, Canada.

American troops land in Somalia for Operation Restore Hope.

Israeli–Palestinian conflict: The First Intifada begins in the Gaza Strip and West Bank.

The eradication of the smallpox virus is certified, making smallpox the first of only two diseases that have been driven to extinction (with rinderpest in 2011 being the other).

British and Irish authorities sign the Sunningdale Agreement in an attempt to establish a power-sharing Northern Ireland Executive and a cross-border Council of Ireland.

Indo-Pakistani War: The Indian Air Force executes an airdrop of Indian Army units, bypassing Pakistani defences.

U.S. Secretary of State William P. Rogers proposes his plan for a ceasefire in the War of Attrition; Egypt and Jordan accept it over the objections of the PLO, which leads to civil war in Jordan in September 1970.

Douglas Engelbart gave what became known as "The Mother of All Demos", publicly debuting the computer mouse, hypertext, and the bit-mapped graphical user interface using the oN-Line System (NLS).

Kecksburg UFO incident: A fireball is seen from Michigan to Pennsylvania; with witnesses reporting something crashing in the woods near Pittsburgh.

Tanganyika becomes independent from Britain.