Why is State governments responsible for sharing the costs with the federal government of all of the following except?

State governments share costs with the federal government for various programs and services, such as Medicaid and infrastructure projects, to ensure a collaborative approach to governance and resource allocation. However, they typically do not share costs for federal programs that are fully funded and administered by the federal government, such as national defense or federal law enforcement, as these responsibilities lie solely within federal jurisdiction. This division helps maintain a balance of power and financial responsibility between state and federal entities.