Which of the following is a current significant state level responsibility?

The correct choice highlights a significant state-level responsibility, which involves providing police protection. State governments are primarily responsible for maintaining law and order and ensuring public safety through local law enforcement agencies. This function is essential as it allows states to address crime, enforce laws, and protect the rights of citizens within their jurisdictions.

In contrast, the other options relate to responsibilities that fall outside state jurisdiction. Declaring war is a power reserved for the federal government under the Constitution, as it relates to national defense and international relations. Similarly, printing money is also a federal responsibility, managed by the U.S. Department of the Treasury and the Federal Reserve System, to maintain a stable national economy. Negotiating treaties is another power exclusively held by the federal government, requiring the president to engage with foreign nations, although ratification is contingent upon Senate approval. Therefore, the provision of police protection stands out as a crucial function performed by state governments.