On November 3, 1997, President Clinton issued Executive Order No. 13067, which imposed a trade embargo prohibiting American businesses from operating in Sudan and placed a total asset freeze against the Government of Sudan. The Khartoum regime had been implicated in exporting terrorism and in the prevalence of human rights violations, including slavery and the denial of religious freedom to the non-Islamic minority in the South of Sudan.
Ergo, because of comprehensive US sanctions against Khartoum, imposed in 1997, no American companies could directly operate in Sudan (these sanctions were renewed by President Bush on November 1, 2005).
Lao Tzu, a sixth century B.C. philosopher and the Father of Taoism, is quoted as having said: “there is no greater disaster than greed.