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This contains several databases that might be useful: U.S. Supreme Court Library, U.S. Presidential Library, law journals for analysis of U.S. law. Look for the menu in the upper left corner to see a list of all the databases in Hein.
Substative background information about the laws, institutions, and actors that have governed America throughout its history, covering topics like from presidents and Supreme Court justices to specifics of policy history, critical legislation, and party formation. This is a great source for gaining context about your topic.