It would not surprise me if civilizations evolved in the same way life did on Earth. Life evolved in the sea. At some point life evolved to leave the sea and g

It would not surprise me if civilizations evolved in the same way life did on Earth. Life evolved in the sea. At some point life evolved to leave the sea and go to land, whether the sea was no longer hospitable enough, or in search of better food. Life continued to evolve on Land, specializing into different groups and colonizing different lands. Perhaps civilizations evolve on their planet, then at some point they leave their planet and go into space (when their planet is no longer hospitable or they need more/better food). Finally, while in space they evolve more, founding different colonies that evolve differently due to culture and environmental differences.