The language of a conqueror tends to spread through hierarchical diffusion.

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Hierarchical diffusion occurs when cultural traits or innovations spread to larger, more influential areas or groups first, often through the influence of social elites or powerful figures, such as conquerors. When a conqueror takes over a region, their language often becomes a lingua franca or even replaces local languages, spreading through the established hierarchies and institutions.

The Language of a Conqueror Tends to Spread Through Hierarchical