The boat pictured is a model of an Ancient Greek warship. Why would the ancient Greeks have needed to develop a strong navy in order to fight with other nation?

The Ancient Greeks needed to develop a strong navy in order to protect their trade routes, defend their coastal cities, and project their power across the Mediterranean. The Greeks were a seafaring people, and their navy was essential for their economic and political success. The navy was also used to fight against other nations, such as the Persians, who threatened Greek independence. The navy was also used to support the Greek colonies in the Mediterranean, and to protect them from hostile forces.