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- emigration and immigration (45)
- history (23)
- united states (22)
- social aspects (18)
- immigrants (17)
- social conditions (17)
- government policy (15)
- emigration and immigration law (12)
- economic aspects (11)
- refugees (8)
- 研究 (8)
- 移民 (6)
- europe (5)
- illegal aliens (5)
- transnationalism (5)
- asia (4)
- cultural assimilation (4)
- emigration and immigration in literature (4)
- great britain (4)
- political aspects (4)
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