How has war and conquest could promote cultural interaction and the spread of civilized complexity?

Please explain to me using examples from the Greece and Mesopotamian era how war and conquest spread there culture and civilized complexity. Please let me know how?|||War often displaces people. People being displaced often move to other societies of different cultures. As a result, cultural diffusion occurs. Cultural diffusion is the mixture of different cultures. The people being displaced share their traditions to the people of the society they move into.





Conquest causes cultural diffusion as well...





The mixture of different cultures can create civilized complexity because as the cultural diffusion occurs, civilizations become more complex but remain orderly or civil.