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In page Scottish independence:

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Following the 2019 United Kingdom general election, which saw the SNP win 48 out of 59 seats, Sturgeon asked Boris Johnson for permission to hold another referendum. He wrote her a formal letter explaining why he declined her request, citing the "once in a generation" promise she and her predecessor Alex Salmond made in 2014, before the referendum, and the majority of Scottish people voting to stay part of the United Kingdom.[7]