With his party’s biggest electoral victory since Margaret Thatcher captured a third term in 1987, Mr. Johnson is now assured of leading Britain through its most momentous transition since World War II. Here are the latest updates.

Related: The opposition Labour Party suffered its worst showing in more than 80 years, putting enormous pressure on its leader, Jeremy Corbyn, to resign. He said today that he wouldn’t lead the party into another election but would stay on for the time being.

The details: Mr. Johnson ran on a promise to “get Brexit done,” a platform that seemed to win over areas that had traditionally voted for Labour. See our map for more.

Another angle: The success of the Scottish National Party on Thursday is likely to intensify the debate over independence for Scotland, which voted against Brexit.