We know this thanks to archaeologists who excavated many places and discovered that many early civilizations gathered around large rivers where they could develop agriculture. This was seen in places such as Mesopotamia, India, China, Egypt, etc.
Answer:
Arab-Israeli wars, series of military conflicts between Israeli forces and various Arab forces, most notably in 1948–49, 1956, 1967, 1973, 1982, and 2006.
