Nearly 7,000 Syrians who were granted temporary permission to live and work in the United States as a civil war devoured their country will be allowed to stay for at least another 18 months, the Trump administration announced on Wednesday, in an acknowledgment that Syria continues to be rattled by conflict.

The decision came as a major relief to Syrians and their advocates. Over the past year, the administration has ended Temporary Protected Status, as the humanitarian program is known, for Salvadorans, Haitians and Nicaraguans, decisions that will collectively expose more than 326,000 people to deportation.

The homeland security secretary, Kirstjen M. Nielsen, said that the situation in Syria justified allowing Syrians to remain in the United States.