Aristide was briefly president of Haiti, until a September 1991 military coup. The coup regime collapsed in 1994 under U.S. pressure and threat of force (Operation Uphold Democracy), and Aristide was president again from 1994 to 1996 and from 2001 to 2004. He was ousted in the 2004 coup d'état after right-wing ex-army paramilitaries invaded the country from across the Dominican border. Aristide and many others have alleged that the United States had a role in orchestrating the coup against him.