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The Late Bronze Age collapse was a period of societal collapse in the Mediterranean basin during the 12th century BC. It is thought to have affected much of the Eastern Mediterranean and Near East, in particular Egypt, Anatolia, the Aegean, eastern Libya, and the Balkans. The collapse was sudden, violent, and culturally disruptive for many Bronze Age civilizations, creating a sharp material decline for the region’s previously existing powers.
Competing theories of the cause of the Late Bronze Age collapse have been proposed since the 19th century, with most involving the violent destruction of cities and towns. These include climate change, volcanic eruptions, droughts, disease, invasions by the Sea Peoples, economic disruptions due to increased ironworking, and changes in military technology and strategy that brought the decline of chariot warfare. Following the collapse, gradual changes in metallurgic technology led to the subsequent Iron Age across Europe, Asia, and Africa during the 1st millennium BC. Scholarship in the late 20th and early 21st century introduced views that the collapse was more limited in scale and scope than previously thought. While these various mutually compatible explanations for the collapse have been proposed, is a migratory invasion by groups such as the Sea Peoples the answer?
https://en.wikipedia.org/wiki/Late_Bronze_Age_collapse