AP® Human Geography · Unit 6 · Topic 6.5
The Galactic City and Latin American, Southeast Asian, and African Models
The galactic city model shows a metro area built around a weakened downtown and several self-sufficient edge cities on a ring road, while the Latin American, Southeast Asian, and African models describe cities shaped by their own colonial and economic histories instead.
Picture a city from above at night. An old downtown still has lights, but so do several other bright clusters out along the beltway, each with its own offices, malls, and housing. That is the galactic city model. As cars and highways let people and businesses spread out, the single downtown stops being the only place worth building up. Edge cities form at highway interchanges, each acting like a mini-downtown with its own jobs and shopping, so the metro area looks like a galaxy of nodes connected by ring roads rather than one star with suburbs orbiting it.
The Latin American city model keeps a strong, often colonial-era center, but adds a spine: a narrow corridor of high-end housing, shops, and offices running outward from the central plaza along one prestigious boulevard, often toward a mall or country club. Wealth clings to that spine. Move away from it and quality of housing drops fast, ending in rings of informal settlement with little infrastructure at the city's edge, the opposite of the North American pattern where the poor cluster near downtown.
Southeast Asian cities, in a model associated with geographer T.G. McGee, often grew around a colonial port zone rather than a single commercial core, with a mix of market gardening, commercial, and squatter areas layered near that port. African city models frequently show three separate business districts, colonial, traditional, and informal, side by side, reflecting layered histories of precolonial trade, colonial rule, and postcolonial growth. All three models push back on treating the North American model as universal.
Key terms
- Galactic city model
- A model showing a metro area with a weakened downtown and multiple self-sufficient edge cities linked by ring roads.
- Edge city
- A cluster of offices, retail, and housing built at a highway interchange outside a traditional downtown.
- Spine
- In the Latin American city model, the corridor of wealthy housing and commerce extending from the central plaza along a major boulevard.
- Informal settlement
- Housing built without legal land rights or formal infrastructure, often found on the periphery of cities in developing regions.
- Colonial core
- The historic central district of a city shaped by the administrative and commercial needs of a former colonial power.
Watch it explained
- How it worksHow does the galactic city model replace one downtown with edge cities on a ring road?
- Worked exampleShow me the Latin American city model with its spine of wealth running out from the center.
- Going furtherWhat changes in the Southeast Asian and African models compared with the North American one?
- Common mistakeWhy isn't the North American model a good fit for cities that grew up under colonial rule?
Check yourself
End of topic.