The exact databases you'll use for your topic will of course vary by topic, but here are those most likely to be useful:
Index to scholarly journals from Latin America in all subject areas.
Compilation of the most important historical documents and legislation related to immigration in the United States as well as current hearings, debates and recent developments in immigration law. This first comprehensive database includes Board of Immigration Appeals, Precedent Decisions, legislative histories, law and policy titles, extradition titles, scholarly articles, an extensive bibliography, and other related works.
Articles in important academic journals from all disciplines (latest few years not available); also eBooks from leading academic publishers, as well as some images.
Contains more than 1,620 law and law-related periodicals. Database Guide
Citations to critical research of language, literature, and folklore for all periods beginning with the Middle Ages.
Current humanities and social science journals from a variety of university presses.
Full-text periodicals and other sources for diverse religious and spiritual studies, covering formal theological studies and commentary on topics of general interest from the perspectives of many worldwide religions. As well as scholarly journals there are many titles from religious publishing bodies and nondenominational organizations.