New Zealand's prime minister, a liberal icon, is stepping down

The World

Jacinda Ardern was only 37 when she became prime minister of New Zealand. She soon earned accolades as a standard bearer for progressive and democratic values. But these 5 1/2 years have not been easy. In a surprise announcement on Thursday, Ardern said she no longer has the energy to continue in office. The World's Sarah Birnbaum has our story.

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