What power allows Congress to regulate interstate commerce?

The ability of Congress to regulate interstate commerce falls under the category of expressed powers. Expressed powers are those that are specifically enumerated in the Constitution, particularly in Article I, Section 8, which grants Congress the authority to "regulate commerce with foreign nations, and among the several states, and with the Indian tribes." This clear articulation in the Constitution gives Congress the direct authority to oversee and manage commerce that crosses state lines.

While implied powers also play a role in Congress's authority, especially in relation to further legislative actions derived from expressed powers, the specific power to regulate interstate commerce is explicitly stated, making it an expressed power. Delegated powers refer to powers that are specifically given to the federal government, while reserved powers are those not granted to the federal government and are held by the states. Therefore, in the context of interstate commerce, the correct classification is indeed expressed powers, as outlined directly in the Constitution.