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In this video Heimler covers everything you need to know about AP Human Geography Unit 3 Topic 4 (3.4) which is all about cultural diffusion. When cultural traits spread, they will do so from a place of origin called a cultural hearth. From there, the distribution of those traits can be described spatially by either relocation diffusion or expansion diffusion ( of which, contagious, hierarchical, and stimulus diffusion are subtypes).