The United States bought Alaska from Russia in 1867, but Russian Orthodox churches can still be found on Sitka Island, Alaska. What method of cultural diffusion is this?

Russian Orthodox churches remain in Alaska because Russians brought their religion and cultural practices with them when they migrated to the region. This is cultural diffusion through migration, the movement of people who carry aspects of their culture to a new place. Trade, technology, and travel do not best explain the lasting presence of these churches.

AI-written and checked against the verified answer.