Breaking: Liz Truss replaces Boris Johnson as UK’s Prime Minister

Britain’s Conservative Party announced on Monday that its members had chosen Liz Truss to replace Boris Johnson as leader, turning to a hawkish diplomat, party stalwart and free-market champion to govern a country facing the gravest economic crisis in a generation.

Ms. Truss, 47, prevailed over Rishi Sunak, a former Chancellor of the Exchequer, whose resignation in July set in motion Mr. Johnson’s messy ouster. Her victory, by a margin of 57.4 percent to 42.6 percent, was widely expected in recent weeks after she took a commanding lead in the polls.

It makes her Britain’s fourth prime minister in six years and third female leader, after Margaret Thatcher and Theresa May. Like them, she will be greeted by a fearsome array of problems.

“I campaigned as a Conservative, and I will govern as a Conservative,” Ms. Truss told a party gathering in a businesslike speech after her victory was announced. “I will deliver a bold plan to cut taxes and grow our economy,” she added. “Dealing with people’s energy bills but also dealing with the long-term issues we have on energy supply.”

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Ms. Truss, who served in Mr. Johnson’s cabinet and was not part of the Tory rebellion that led to his departure, will formally assume the prime minister’s title on Tuesday in a meeting with Queen Elizabeth II at Balmoral Castle in Scotland, where the queen is vacationing. Mr. Johnson will bid farewell to the monarch just before that, drawing a curtain, at least for now, on his career as a frontline politician.

Ms. Truss, who was most recently foreign secretary, emerged from a crowded field of eight candidates by appealing to party members with a single-minded message of tax cuts and smaller government. These are reliable Tory party touchstones, but some economists said her proposals would do little to solve Britain’s problems, and could even worsen them.

Ms. Truss won 81,326 votes to Mr. Sunak’s 60,399 votes, a margin that while comfortable was not as overwhelming as some of the polls suggested it would be. Analysts noted that Mr. Sunak, not Ms. Truss, was the top choice of Conservative lawmakers in the first round of the leadership contest.

Still, Ms. Truss has made a remarkable political journey to the top of the Conservative Party. Raised in a left-wing family, with a father who was a mathematician and a mother who was a nurse and teacher, she was an active member of Britain’s centrist party, the Liberal Democrats, as a student at Oxford University, once calling for a vote to abolish the monarchy.

Ms. Truss is likely to be judged by her handling of Britain’s coming economic storm. With household energy bills spiking by 80 percent, and some economists predicting that inflation will top 20 percent by early next year, many believe Ms. Truss will have to announce sweeping measures to shield vulnerable families.