It caused a period of chaos in Canaan. The palace economies of the Aegean region and Anatolia collapsed. It caused a cultural collapse of the Kassite dynasty of Babylonia, of the Mycenaean kingdoms, of the Hittite Empire in Anatolia and the Levant, and of the Egyptian Empire. Ugarit and the Amorite states in the Levant were destroyed. The Luwian states of western Asia Minor were fragmented. Elam, Assyria, and Babylon all declined.
Hope this helped. The question is kinda broad though. Maybe ask something more specific?