The United Kingdom left the European Union, also known as “Brexit.”
The withdrawal agreement was ratified at 23:00.
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The first American satellite, Explorer 1, was launched into space.
British driver Arthur MacDonald was the first to break 100 miles per hour in an automobile at Daytona Beach, Florida, US.
Doug Williams became the first African-American quarterback to play in the Super Bowl.
Jesse James's gang robbed up to $22,000 on a train at Gads Hill, Missouri, US.
Alvan Graham Clark discovered the white dwarf star Sirius B.
