The Rumble in the Jungle was a historic boxing event in Kinshasa, Zaire (now Democratic Republic of the Congo) on October 30, 1974wikipedia
Kinshasa is in Africa, which is far away from USA. It was inconvenient for not only Ali and Foreman, but also the thousands of people who watched the match.
Then why was not it held in USA?
Short version, Don King signed on Ali and Foreman with the promise of a $5 million purse, but didn't have the cash, so he accepted an offer to host and finance by Mobutu Sese Seko. (Wikipedia)
Don King arranged this fight with the music businessman Jerry Masucci, who took his famed musicians, Fania All Stars, to play at the venue. King managed to get Ali and Foreman to sign separate contracts saying they would fight for him if he could get a $5 million purse each. However, as King did not have the money, he began seeking an outside country to sponsor the event. Zaire's dictator Mobutu Sese Seko, eager for the publicity such a high-profile event would bring, asked for the fight to be held in his country.
There were also race relations reasons. Zaire was an independent African nation ruled by a black man, and Foreman and Ali were example of strong Black men, particularly Ali with his ties to Black Nationalism, and Mobuto was facing disapproval of his U.S. government-backed overthrow of Lumumba, so he was looking for any good publicity he could find. (Daily Beast)
