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Specialized databases and websites explain issues within broader contexts and from differing viewpoints. This helps with understanding the "big picture" and can often help with forming ideas for narrowing topics.
Browse or search recent reports, and pay particular attention to the beginning overview and the "Issues for Congress" section of the report. You may not use the CRS report as a source in your project, but it can spark some ideas for you to follow up on.
www.nytimes.com/passes to start your free NYT subscription
Background Information -- Reference Collections
Need to look up a term, name, place, or event? Reference collections are great places to START the research process. Results are authoritative and trustworthy. Bonus--most include formatted citations at the bottom of each entry!