National parks across the United States have welcomed millions of visitors this summer to enjoy their fragile beauty, wildlife and ecosystems. But at least one-fifth of the country’s 433 parks have been significantly strained and understaffed because of steep cuts mandated by the Trump administration, according to internal government data obtained by The New York Times.

Staffing at the National Park Service had been steadily shrinking in the past decade because of tightened budgets. But it has lost 24% of its permanent employees since President Donald Trump took office, according to data compiled by the nonprofit National Parks Conservation Association. Among those who left: more than 1,800 park workers who accepted the administration’s resignation initiatives, devised to quickly reduce t

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