NEW YORK — On a sweltering summer day, children leap between rocks along the Bronx River while cyclists pedal on newly paved paths. Kayaks rest on what was once an industrial dumping ground, now transformed into a bustling promenade along the city’s only freshwater river.

The Bronx River Greenway, a series of stitched-together waterfront parks built atop once largely abandoned and polluted wasteland, is a hard-fought victory for the country’s poorest congressional district — one that locals call a “beacon of environmental justice” built by federal dollars and water-pollution settlements from the borough’s wealthier neighbors.

Now, like thousands of nonprofits around the country, this organization’s future is in jeopardy. The Trump administration’s sweeping federal grant cuts have left

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