What is an example of a power reserved to the states?

Creating school systems is a clear example of a power reserved to the states because education is primarily governed by state law, and each state has the authority to establish its own educational policies, curricula, and funding mechanisms. The Tenth Amendment to the United States Constitution reserves powers not specifically delegated to the federal government for the states and the people, and education is traditionally viewed as a function of state and local government.

In contrast, powers like declaring war, coining money, and making treaties are explicitly reserved for the federal government. These actions require a level of authority and coordination that is best managed at the national level, given their implications on foreign policy and currency stability. As a result, while states have significant control over local governance and policy areas such as education, certain critical powers are maintained by the federal government to ensure national integrity and cohesion.