What is a "circuit split"? List two mechanisms by which a circuit split may be resolved.

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The Answer is A circuit split occurs when two or more federal circuit courts of appeals interpret the rule of law on a particular issue in different ways; the net result is that federal law is NOT uniform across the country on that particular point.
The most common way for a circuit split to be resolved is for the Supreme Court to grant cert and decide the rule of law, which is then binding on all courts. Alternatively, assuming a constitutional issue is not involved), Congress may pass a statute clarifying what the rule of law is.

What Is a "Circuit Split"? List Two Mechanisms by Which