Foreign Policy posted on 3 December 2021 an analysis titled "The Battle for Khartoum Exposes Waning U.S. Influence" by Colum Lynch and Robbie Gramer.
The authors argue that the Sudan crisis offers a window into the messy and often convoluted nature of U.S. diplomacy as the United States' unipolar moment vanishes. Sudan is a case study in how Washington's inattention to Africa over the decades has sown the seeds of waning U.S. influence across the continent, particularly on issues at the core of U.S. foreign policy, from the promotion of democracy and human rights to the war on terror.
Comment: The U.S. unipolar moment vanished some time ago. While U.S. influence in Sudan may have experienced a decline in recent weeks, I don't see that anyone else has stepped in to replace it.