Sweden’s first female prime minister, the Social Democrat Magdalena Andersson, has resigned less than 12 hours into the job when her coalition collapsed. Andersson said a decision by the Green party, the junior party in the coalition, to quit had forced her to resign from the post. ‘I have asked the speaker to be relieved of my duties as prime minister,’ Andersson said. ‘I am ready to be prime minister in a single-party, Social Democrat government.’