From the Document: "After the 2016 referendum in which 52% of voters in the United Kingdom (UK) favored leaving the European Union (EU), 'Brexit' was originally scheduled to occur on March 29, 2019. In early 2019, however, Parliament repeatedly rejected the withdrawal agreement negotiated between Prime Minister Theresa May's government and the EU without supporting any alternative. Given continued political deadlock over Brexit in the UK, the EU has granted the UK three deadline extensions. The most recent extension lasts until January 31, 2020."
CRS Report for Congress, R45944
Congressional Research Service: https://crsreports.congress.gov/