Which of the following is a power shared by both federal and state governments?

Enforcing laws is indeed a power that is shared by both federal and state governments, which exemplifies the concept of concurrent powers in a federal system. Both levels of government have the authority to create and enforce their own laws within their respective jurisdictions. This shared power allows for a system in which federal laws can coexist with state laws, often addressing different but overlapping issues, such as criminal law, environmental regulations, and public safety.

In contrast, conducting local elections is primarily managed by state and local governments, as these entities are responsible for managing elections within their jurisdictions, operating under the guidelines set by state law. Establishing schools is also a power primarily held by state and local governments, as education systems are largely governed at the state level, reflecting local needs and priorities. Raising armies is a power reserved for the federal government, as it alone has the authority to maintain armed forces and conduct national defense.