The United Kingdom left the European Union, also known as “Brexit.”
The withdrawal agreement was ratified at 23:00.
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The European Union formally opened accession negotiations with Ukraine.
MP's in the UK voted in favor of triggering the European Union Bill (Article 50), which gave the government the power to prepare to leave the European Union.
The Euro currency was introduced and adopted by 11 Member States.
The UK's prime minister Boris Johnson compared himself to The Hulk in his efforts to steer the country out of the European Union.
The EU declared that single-use plastics would be banned by 2021.
