Final answer:
Legislatures, judicial decisions, and executive orders & administrative regulations are all sources of law in the United States.
Step-by-step explanation:
The source of law in the United States includes legislatures, judicial decisions, executive orders & administrative regulations. Legislatures refer to the legislative branch of government, which consists of elected representatives who create and pass laws. Judicial decisions refer to the court system interpreting and applying the law. Executive orders & administrative regulations are directives issued by the President or administrative agencies that have the force of law.
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