Which of the following is not a source of law in the U.S.?

Propaganda is not a recognized source of law in the United States. The formal sources of law include case law, international treaties, and statutory law.

Case law refers to the body of law that develops through judicial decisions and interpretations of statutes and regulations, establishing precedents for future cases. International treaties are agreements between countries that can have legal standing within the U.S. if ratified by the Senate and are typically enforced under international law. Statutory law consists of the written laws passed by legislative bodies at both federal and state levels.

In contrast, propaganda is generally understood to be information—often biased or misleading—used to promote a particular political cause or point of view. While propaganda can influence public opinion and behavior, it does not carry any legal authority or enforceable standards, making it distinctly different from established sources of law.