On This Day, Dec. 14: Dozens killed in Sandy Hook massacre

Mourners gather near a memorial filled with flowers, stuffed toys and candles at the entrance to Sandy Hook Elementary School in Newtown, Conn., following a shooting December 14, 2012. File Photo by John Angelillo/UPI
Mourners gather near a memorial filled with flowers, stuffed toys and candles at the entrance to Sandy Hook Elementary School in Newtown, Conn., following a shooting December 14, 2012. File Photo by John Angelillo/UPI
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Dec. 14 (UPI) -- On this date in history:

In 1287, more than 50,000 people died in a flood caused by the collapse of the Zuider Zee dike in the Netherlands.

In 1799, George Washington, war for independence military leader and first president of the United States, died at his Mount Vernon home in Virginia.

In 1819, Alabama became the 22nd state in the United States.

In 1911, Norwegian explorer Roald Amundsen became the first person to reach the South Pole. The world would have to wait until March 7, 1912 before learning of Amundsen's triumphant feat.

Sandra Lindsay, (L) a nurse at Long Island Jewish Medical Center, is inoculated with the COVID-19 vaccine by Dr. Michelle Chester on December 14, 2020, in the Queens borough of New York. File Photo by Mark Lennihan/UPI
Sandra Lindsay, (L) a nurse at Long Island Jewish Medical Center, is inoculated with the COVID-19 vaccine by Dr. Michelle Chester on December 14, 2020, in the Queens borough of New York. File Photo by Mark Lennihan/UPI

In 1972, Apollo 17 commander Eugene Cernan re-entered the lunar lander -- the last man to walk on the moon.

File Photo by Kevin Dietsch/UPI
File Photo by Kevin Dietsch/UPI
On December 14, 1911, Norwegian explorer Roald Amundsen became the first person to reach the South Pole. File Photo by Library of Congress/UPI
On December 14, 1911, Norwegian explorer Roald Amundsen became the first person to reach the South Pole. File Photo by Library of Congress/UPI

In 1988, the United States announced the start of a "substantive dialogue" with the Palestine Liberation Organization for the first time.

In 1989, Andrei Sakharov, father of the Soviet hydrogen bomb, dissident and Nobel Peace Prize winner for defending human rights, died at age 68.

Princess Diana responds to reporters' questions after she and her then-husband Prince Charles toured the National Gallery of Art on November 10, 1985. On December 14, 2006, the official British police investigation into the 1997 death of Princess Diana in a Paris car crash concluded that it was an accident and no conspiracy or foul play was involved. File Photo by Doug Mills/UPI

In 1995, the signing of a peace treaty at a ceremony in Paris officially ended a four-year civil war in Bosnia-Herzegovina.

In 2005, Iranian President Mahmoud Ahmadinejad said the Holocaust was a "myth" and called for Israel to be moved to Europe or North America.

File Photo by Mohammad Kheirkhah/UPI
File Photo by Mohammad Kheirkhah/UPI

In 2006, the official British police investigation into the 1997 death of Princess Diana in a Paris car crash concluded that it was an accident and no conspiracy or foul play was involved.

In 2012, a gunman killed 27 people, including 20 children at Sandy Hook Elementary School in Newtown, Conn., then killed himself. Police said the black-clad attacker, Adam Lanza, 20, killed his mother before going to the school.

In 2017, the Federal Communications Commission repealed Obama-era net neutrality rules, loosening regulations on Internet service providers.

In 2020, the United States began administering its first COVID-19 vaccine, made by Pfizer-BioNTech.

In 2022, U.S. President Joe Biden announced that the U.S.-Africa leaders summit in Washington, D.C., had produced more than $15 billion in new deals expected to improve the lives of people across the African continent.

File Photo by Michael Reynolds/UPI
File Photo by Michael Reynolds/UPI