why brexit happened?

Has the UK actually left the EU already
After the December 2019 election, the British Parliament finally ratified the withdrawal agreement. The UK left the EU at the end of 31 January 2020 CET (11 p.m. GMT). This began a transition period that ended on 31 December 2020 CET (11 p.m. GMT), during which the UK and EU negotiated their future relationship.
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When did the UK leave the EU?
On Thursday 23 June 2016 the EU referendum took place and the people of the United Kingdom voted to leave the European Union. This page contains government information on the EU referendum.
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Why did the UK leave the EU?
It has been suggested that Britain's reservations about European integration, as well as its unique historical position within Europe and stance of remaining less integrated than other EU states, laid the groundwork for the potential that Britain would decide to exit the bloc.
Full answer in: en.wikipedia.org
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