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Topic:

"What does American federal law say about religious expression?"

Key concepts :

American AND federal law AND religious expression

Explanation:

1. "What" is unnecessary. Question words don't express concepts & should not be used in your search.
2. Words like "about," "of," & "in" do not express concepts and are typically never used in searches unless they are considered a vital part of a phrase that expresses a major concept, as in a name (for example, "Treaty of Versaille").
3. "Federal law" and "religious expression" each a major concept.
4. If you think that "American" is not major concept of this topic, realize that you will want to be sure you research about American law and American religous expression, so you will probably need "American" in your search.