Final answer:
Preemption is when federal regulations supersede state laws, demonstrated through the example of national water pollution regulations overridden by the Clean Air Act.
Explanation:
Preemption occurs when federal officials enforce regulations that override state laws, as seen in the example of national water pollution regulations set by the Clean Air Act. This process delegates the enforcement of national standards to state and local governments while setting overarching regulatory guidelines at the federal level.
Home rule refers to the authority of local governments to enact and enforce laws without interference from state governments, while states' rights advocate for the autonomy and powers of individual states within a federal system.
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