After Jimmy and Rosalynn Carter linked themselves to Habitat for Humanity, it grew and built homes for millions. Now, their cause is a national crisis.

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Plains, Ga., had been bracing for the inevitable through the former president’s ailments and nearly two years of hospice care. Still, his death, at 100, “doesn’t seem real.”

© Nicole Craine for The New York Times

Nicholas Kristof on what the former president’s legacy meant to him — and the world.

What the 39th president did before he got to the White House is as interesting as what came after.