Question: when did we decide to leave the eu?
Evidence: Brexit (/ˈbrɛksɪt, ˈbrɛɡzɪt/; portmanteau of "British exit") was the withdrawal of the United Kingdom (UK) from the European Union (EU). Following a referendum on 23 June 2016, Brexit officially took place at 23:00 GMT on 31 January 2020 (00:00 1 February 2020 CET).
Answer: 23 June 2016