“It is then entirely up to the people of Scotland to decide that choice,” Ms Sturgeon said.
A spokesman for Mr Johnson said the government would consider Ms Sturgeon’s proposal but the UK should focus on ‘building a stronger economy‘.
Who wants independence, and who doesn’t?
In Scotland, the main opposition to the SNP and its quest for Scottish sovereignty is the Scottish Conservative Party, led by Douglas Ross.
“There’s also a feeling that Scotland is politically different, leaning a bit more to the left than the average voter in the rest of the UK.”
Rangers fans often display the Union Jack at games as a sign of support for the Crown. Credit: Kirk O’Rourke/PA
According to The Mirror’s analysis of voting records between 1983 and 2015, Glasgow – Scotland’s most populous city – is also the UK’s most left-wing city.
Rangers fans usually wear the Union Jack to show their support for the Crown and their unity with England.
What happened last time, and will this time be different?
The SNP says that if Scotland succeeds in gaining independence, it will try to negotiate with the EU to bring the country back into the bloc.
Supporters of the Yes for EU campaign group outside the Scottish Parliament at Holyrood in Edinburgh to protest against Brexit. Credit: Andrew Milligan/AP
What is the link with Catalonia?
During independence demonstrations in both countries, the Catalan pro-independence flag is often flown alongside the Scottish flag, as a sign of solidarity.
Pro-Catalan independence protesters march through Edinburgh’s west to the offices of the European Commission. Credit: Ken Jack/Corbis via Getty Images
Similar to Scotland, Catalonia was its own country before seeing its sovereignty taken by a monarchy.
On election day, Spanish police raided schools where voting was taking place and forcibly prevented civilians from voting. Human rights groups such as Amnesty International have condemned their actions as examples of police brutality.
Catalan pro-independence protesters march during a demonstration in Barcelona. Source: PA / Emilio Morenatti/AP
Five years later, the Catalan government still claims to want to organize a new referendum.
The Spanish Supreme Court sentenced nine Catalan political and social figures to nine to thirteen years in prison for their participation in the referendum.
After the unauthorized referendum, former Catalan government leader Carles Puigdemont fled Spain to Belgium, where he still lives in exile and continues to campaign for Catalan self-determination.