19.1 Cultural Diffusion & Assimilation

Why This Topic Matters on the GED Social Studies Test

Within the Geography and the World domain (15% of the test), one blueprint sub-topic — G.d.2, Culture, cultural diffusion, and assimilation — asks you to explain how cultural practices, ideas, technologies, and languages spread from one group or place to another, and what happens when groups come into sustained contact. These items rarely ask you to recall a date. Instead, GED test writers hand you a short passage, map, or scenario — a food, a religion, a slang term, or a piece of technology moving across a map — and ask you to name the underlying geographic process or predict what happens next. Getting this section right comes down to keeping a small set of vocabulary words straight, because the wrong-answer choices on these items are almost always one of the other correct-sounding terms from the very same list.

Core Terms: How Culture Moves

Cultural diffusion is the general term for the spread of cultural traits — ideas, customs, religions, languages, foods, and technologies — from their point of origin to other groups or places. Geographers split diffusion into two broad mechanisms.

Relocation diffusion happens when people physically move and carry their culture with them. When Vietnamese refugees brought pho restaurants to cities across the United States after 1975, or when Puerto Rican migrants brought Spanish-language radio and reggaetón to New York in the 1950s and 1960s, the culture traveled because the people did.

Expansion diffusion happens when an idea spreads outward from its point of origin while the people who started it stay largely in place. The GED tests three common sub-types of expansion diffusion:

• Contagious diffusion spreads rapidly, person-to-person, regardless of social status, moving outward like a wave — the early spread of Christianity and Islam along Mediterranean and Silk Road trade routes is a classic historical example.
• Hierarchical diffusion spreads from larger, more influential places or people down to smaller ones, effectively "skipping" the space in between. Hip-hop's spread from the South Bronx in the 1970s — first to major U.S. cities, then internationally, before reaching smaller markets — is a textbook hierarchical-diffusion case, because it followed a chain of cultural influence rather than uniform, place-to-place contact.
• Stimulus diffusion spreads the general idea, but the idea is modified to fit the local culture rather than adopted exactly as-is. A global fast-food chain operating worldwide but swapping beef for a potato-based patty in a market where beef consumption conflicts with local religious practice is a stimulus-diffusion case: the concept of the franchise diffused, but the specific product did not.

Assimilation, Acculturation, and Cultural Pluralism

A second, related but distinct concept describes what happens after diffusion brings two cultures into sustained contact.

Assimilation describes a minority or immigrant group gradually adopting the language, customs, and values of the dominant surrounding culture — often across a generation or two — sometimes losing distinctive elements of its own culture in the process. Early-1900s Ellis Island immigrants who Anglicized their family names, stopped speaking their native language at home, and raised English-only-speaking children are a classic U.S. history example of assimilation.

Acculturation describes a milder version of contact: a group adopts some elements of a new culture — language, dress, food — while still retaining a distinct identity of its own, rather than being fully absorbed.

Cultural pluralism (sometimes called multiculturalism) describes different groups living side by side and maintaining separate, distinct cultural identities within the same larger society, rather than blending into one. GED passages often frame this contrast using two metaphors: the "melting pot" (assimilation — one blended culture emerges) versus the "salad bowl" or "mosaic" (pluralism — distinct pieces coexist without blending). Amish communities maintaining a separate language, dress, and school system for centuries within the United States are a commonly cited pluralism example.

Exam Scenario Walkthrough

A typical GED stimulus: "A style of street art that originated in Los Angeles in the 1980s appeared in Tokyo and Berlin within the following decade, spreading primarily through gallery exhibitions, magazines, and prominent artists' international tours rather than through migration of the original Los Angeles artists." The correct classification is hierarchical diffusion: the trend moved from an influential origin point through prominent cultural channels to other major cities. It is not relocation diffusion, because the originating artists did not move; it is not contagious diffusion, because it spread through influential "hub" channels rather than uniform person-to-person contact.

A second common trap: a passage describes a Korean immigrant family in the United States that speaks Korean at home, cooks Korean food, and celebrates Korean holidays, while also speaking fluent English at work and following U.S. civic customs. This is acculturation, not assimilation, because the family's original culture is retained alongside the new one rather than replaced by it. If the question instead described a family that had stopped speaking Korean entirely and identified fully with mainstream American culture by the second generation, that would be assimilation.

Key Takeaways

• Relocation diffusion requires people to move; expansion diffusion (contagious, hierarchical, stimulus) spreads an idea without the originators relocating.
• Hierarchical diffusion moves from influential or larger places to smaller ones; contagious diffusion moves uniformly outward through direct contact.
• Stimulus diffusion means the underlying idea spreads but gets locally modified — the classic case is a global product adapted to local tastes or norms.
• Assimilation means a minority group adopts the dominant culture and tends to lose its own; acculturation means a group adds new-culture elements while keeping its own; cultural pluralism means distinct groups coexist without blending.
• On the exam, read for what actually happened in the passage — did people move? did the original idea change? was the original culture lost or retained? — rather than picking whichever vocabulary word merely "sounds related."