The governor of Florida signs a bill that will create a high-speed railway connecting Atlanta to Orlando. However, a court rules that this is an example of interstate commerce and would be under the power of the national government.

The railway would cross state lines, so it involves interstate commerce, an area in which the national government has constitutional authority. The Supremacy Clause makes federal law supreme when state action conflicts with federal authority. Therefore, the court’s ruling illustrates the supremacy clause.

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