Assertion: immigrant | /r/SimilarTo | 18th and 19th centuries
Facets:
value: in the 1920s
type: TEMPORAL
Source sentences:
text: Historians studied the immigrants of the past, (which in the 1920s meant the 18th and 19th centuries), usually in the context of nation-building and settlement of the western United States, while sociologists focused on the immigrant urban workers of their own times —