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immigration × 61united-states × 21
europe × 6
20th-century × 5
jews × 5
19th-century × 4
language × 4
california × 4
mexico × 4
migration × 4
world-war-two × 3
law × 3
united-kingdom × 3
middle-east × 3
colonial-america × 3
travel × 3
demography × 3
emigration × 3
russia × 2
roman-empire × 2
france × 2
england × 2
germany × 2
cultural-history × 2
british-empire × 2
