LANCASTER, Pa. — On an overcast afternoon this month, a block party was in full swing, the hot dogs were going fast, and Chris Underhill, freshly graduated from high school, was savoring a new milestone: He had registered to vote for the first time.

Filling out the form offered by a political activist not much older than him took about three minutes. But its significance was not lost on Mr. Underhill, 18, who grew up in this city on the edge of Amish country, 75 miles west of Philadelphia. An aspiring actor who helped organize a local march following this year’s deadly mass shooting in Parkland, Fla., Mr. Underhill said his everyday worries mirror those that fuel the anxieties of his generation, such as how to pay for college and losing access to health care.

And then there’s the presidency of Donald J. Trump…

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