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Brexit
Brexit came into force after a year of wrangling on:
Explanation and memory cue
Brexit officially took place when the United Kingdom withdrew from the European Union on January 31, 2020. However, this was followed by a transition period during which EU law continued to apply in the UK. This transition period ended on December 31, 2020. Therefore, the date when Brexit fully came into force, marking the UK's full exit from the EU's single market and customs union, is January 1, 2021. This is the date after a year of wrangling when Brexit effectively came into force.