The Trump administration’s expansion of the nation’s contentious travel ban on Friday to include Nigeria, Africa’s most populous nation, and several other countries deeply rattled immigrants, leaving some Nigerians in New York worried that it would break family ties and have a negative effect on both countries.

“Africans have very strong family ties,” said Henry Ukazu, 35, of the Bronx, warning that not allowing people from Nigeria to come to the United States to live would result in negative consequences for both the United States and Nigeria.

Mr. Ukazu, who immigrated to the United States 10 years ago, predicted that the travel ban would bring about “a level of detachment from family members, and that is not a welcome development.”

“We are not wired to be an individual,” Mr. Ukazu said. “We are raised like a bond because we are like a broom, when we are mixed together, we perform very, very well.”