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Migration is not simply individual movement but part of geographic systems involving chains of connection, networks of information, and transnational relationships. Different migration types operate at different scales and have varying geographic impacts. Migration reshapes both origin and destination communities.
Your prerequisites in population distribution and spatial scale established that populations are not distributed randomly — they concentrate in some places and thin out in others due to systematic processes, and these patterns look different depending on which scale you examine. Migration is one of the key processes driving those distributions. But explaining migration as a simple response to push factors (conditions driving people away from origin places — poverty, violence, drought) and pull factors (conditions attracting people to destination places — employment, safety, services) only gets you so far. That framework treats migration as individual rational calculation, when in reality migration is organized through social structures that make some moves much more likely than others.
The central structural concept is the migration network: the web of social ties — family, kin, friends, co-villagers — that connects people in origin communities with migrants already established in destination places. Networks dramatically lower the costs and risks of moving. A prospective migrant who has a cousin in Chicago already has housing on arrival, information about which employers are hiring, and someone to help navigate an unfamiliar city. The result is chain migration: once a few people from a community establish themselves in a destination, they create a network that makes it easier for others to follow the same path. Over time, migration from a specific village to a specific city becomes self-reinforcing regardless of whether the original push/pull conditions still hold.
Transnational migration describes movement that does not sever ties to the origin community but maintains active connections across national borders. Transnational migrants may send remittances — money transferred to family in the origin community — which in many countries represent a larger financial flow than foreign direct investment. They may participate in origin-country politics, fund local infrastructure, or return periodically for festivals and family obligations. Rather than a clean break from one place to another, transnational migrants build lives that span multiple locations simultaneously. This challenges the assumption that migration produces assimilation into the destination culture; many migrants maintain dual or plural identities across space.
The geographic consequences of migration are asymmetric and operate at both ends of the flow. Destination areas gain labor, often concentrated in specific economic niches; they also gain cultural diversity and remittance-funded economic activity in migrant neighborhoods. Origin areas experience brain drain — the selective loss of young, educated, mobile workers — but also receive remittances, return migrants with new skills, and the diffusion of ideas from the destination society. Whether net migration is beneficial or harmful to origin communities is a contested empirical question that depends on scale, sector, and whether migration is circular (migrants return) or permanent. The network lens makes clear that these effects are not random: they trace the specific social structures through which migration is organized.
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