The major challenges to historical research revolve around the problems of sources, knowledge, explanation, objectivity, choice of subject, and the peculiar problems of contemporary history. Sources The problem of sources is a serious challenge to the historian in the task of reconstructing the past.
So Jews could be easily identified so they could be persecuted and to arrest them easier.
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Answer:
Ellis Island was not the only immigration center that welcomed large numbers of foreigners. On the West Coast of the United States, near the city of San Francisco, Angel Island served as an important immigration center from 1910 to 1940. The immigrants at Ellis Island were treated more equally than those at Angel Island. ... The main ethnic groups that came through Ellis Island were English, Irish, Italian, and Polish. ANGEL ISLAND. Immigrants at Angel Island were not treated fairly.
