6m left·0%
Reading Time: 6 min
Last Updated: September 1, 2026
Main Ideas: 5
Reading Time: 6 min
Last Updated: September 1, 2026
Main Ideas: 5

Topic 6.6 Notes – Causes of Migration in an Interconnected World

Verified for 2027 AP® World History: Modern Exam
Read aloud
Migration from 1750 to 1900 got bigger, faster, and more global because industrialization, imperialism, and new transportation tied distant places together. People moved for many reasons at once, from famine and overcrowding to jobs and labor recruitment, and the key to this topic is seeing how pressure, opportunity, coercion, and mobility worked together.

What Drove Migration from 1750 to 1900

Migration had happened for centuries, but this period changed its scale, speed, and distance. Industrial capitalism created huge labor needs, empires linked faraway regions, and steamships and railroads made travel cheaper and more predictable.

A quick vocabulary check helps everything else click:

  • Push factors are reasons people leave, like famine, debt, land shortage, or unemployment.
  • Pull factors are reasons people go somewhere, like jobs, wages, available land, or labor recruiters.

The main patterns you need to recognize:

  • Internal migration means movement within a state or empire, often rural people heading to cities, mines, plantations, or frontier zones.
  • External migration crosses borders, and often oceans too.
  • Some migration was permanent settlement.
  • Some was temporary, seasonal, circular, or return migration.
  • Some was voluntary, some coerced, and some semicoerced through debt, contracts, or deception.

Demographic and Environmental Pressures

Population growth put pressure on land, food, and jobs in both industrial and nonindustrial societies. Rural families could end up with too little land to survive on, or too little work to support themselves.

Environmental crisis often made that pressure unbearable:

  • Crop failure cut food supply and income.
  • Drought damaged agriculture and pushed people off the land.
  • Famine turned hardship into survival migration.

Irish Great Famine

The Irish Great Famine from 1845 to 1852 is the classic example. Potato blight destroyed the crop many poor Irish families depended on. The famine was the immediate push, but deeper problems mattered too:

  • poverty
  • unequal landholding
  • population pressure

A major result was Irish migration to the United States. One exam trap here is thinking hardship automatically caused migration. It didn’t. People also needed money, transport, information, family ties, or recruiters to make the trip possible.

Economic Opportunity and Labor Demand

A lot of migrants moved by choice, even when that choice came from hard circumstances. Industrial capitalism created jobs in very specific places:

  • Factories and construction in industrial cities
  • Plantations and commercial farms
  • Mines and resource frontiers
  • Railroads, ports, and canals
  • Colonial administration and technical work

Internal and external movement

Rural-to-urban migration was huge in this era. People also moved internally toward plantations, mines, and railroads.

Two named examples matter:

  • Irish to the United States for jobs, land, and support from existing Irish communities
  • British engineers and geologists to South Asia and Africa, tied to imperial mining, infrastructure, and investment

That second example is useful because migration was not only poor laborers crossing the Atlantic. It included skilled professionals and happened across Asia, Africa, the Pacific, and the Americas.

Coerced and Semicoerced Labor Migration

The global economy kept using unfree labor even as wage labor grew.

SystemWhat it looked likeKey destinations/examples
Enslavementdirect force, no freedom of movementAtlantic slave trade continued into 19th century; also Africa, Indian Ocean, Middle East, Americas
Indian indentured servitudelimited-term contracts, often deceptive or restrictiveCaribbean, Mauritius, Fiji, southern and eastern Africa, Southeast Asia
Chinese indentured and contract laboroften called the coolie trade; used for harsh laborSoutheast Asia, Caribbean, Peru, Cuba, western North America
Convict laborpunishment tied to forced labor and settlementBritish convicts to Australia

The comparison the AP loves is continuity and change. Continuity means coercion stayed important. Change means coercion more often appeared as indenture or convict transport alongside slavery.

Transportation, Urbanization, and Return Migration

Steamships and railroads did not create migration by themselves. They made existing pressures and opportunities easier to act on.

They allowed:

  • faster, cheaper long-distance travel
  • stronger links between inland areas and ports
  • easier labor recruitment
  • more movement toward industrial and port cities

That helped drive the massive urbanization of the 19th century.

Transportation also made return migration more realistic. Key examples:

  • Japanese agricultural workers in the Pacific
  • Lebanese merchants in the Americas
  • Italian industrial workers in Argentina

Key Takeaways

The best formula for this topic is pressure + opportunity + compulsion + mobility.
The Irish famine was an environmental push, but poverty, land inequality, transportation, and U.S. job opportunities explain why migration became so large.
Voluntary migration still could come from desperate conditions, so “voluntary” does not mean easy or unconstrained.
Indentured labor was legally different from slavery, but on the AP exam you should still treat it as semicoerced labor.
New transportation mattered most because it made migration cheaper, faster, more regular, and sometimes reversible through return migration.
Separate why people migrated, how they migrated, and whether they could return.

AP® is a trademark registered by the College Board, which is not affiliated with, and does not endorse this website.

Notes

1 credit used · 5/5 remaining