President Trump has threatened to send troops to Nigeria, where he says Christianity faces an “existential threat,” an accusation that Nigeria has denied. Ruth Maclean, our West Africa bureau chief, describes how the violence in Nigeria is affecting people of all religions, not only Christians.

Officials have accused the United States of foreign interference and called on Washington to support the country’s democracy instead of fomenting division.

Official election results gave him an eighth term that, if completed, will last until he is 99. Mr. Biya is one of many leaders well over 70 across Africa, the world’s youngest continent.