Elam is another word for ancient Persia, the fall of Babylon is described in https://lenbilen.com/2017/09/24/daniel-5-the-handwriting-on-the-wall/
Kedar, meaning dark-skinned was the second son of Ishmael (Genesis 25:13) . It was also the name for the nomadic tribes of Arabs, the Bedouins generally (Isa. 21:16; 42:11; 60:7; Jer. 2:10; Ezek. 27:21), who dwelt in the northwest of Arabia. They lived in black hair-tents (Song of Songs 1:5). To “dwell in the tents of Kedar” was to be cut off from the worship of the true God (Psalms 120:5). The Kedarites suffered at the hands of Nebuchadnezzar (Jer. 49:28-29).