Subject
- Emigration and immigration law4
- Labor market4
- Migration, Internal4
- Noncitizens4
- Political participation4
- Religion4
- Religious life4
- Social aspects4
- Assimilation (Sociology)3
- Border security3
- Boundaries3
- Employment3
- Foreign workers3
- Infrastructure (Economics)3
- Labor mobility3
- Regional disparities3
- Technological innovations3
- Transnationalism3
- Working class3
- World War, 1939-19453