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Historical and cultural context is part of every topic--none of your topics exist in a vacuum or came into the world fully formed.
Look for overviews for initial context
Credo Reference will show you encyclopedia overviews related to your topic (not everyone will have one that is relevant, but most will). Book introductions often give overviews. Organization websites often give the context of the cause for which they exist.
Your topic may have a documentary (as streaming video) in AVON or on DVD on the library shelves (search OneSearch). This is very useful for getting a visual, personal look at the issues--and hearing it straight from the sources.
Note that bias is much easier to slip through in audiovisual sources.