What is the best definition of Interstate Commerce?

The best definition of Interstate Commerce is the transportation of persons or property between states. This definition reflects the core purpose of the term, which pertains to economic activities that cross state lines, thereby involving more than one state. Interstate commerce is regulated by federal laws to ensure a consistent legal framework and prevent states from interfering with trade between each other.

Transporting goods within a single state pertains to intrastate commerce, which is not covered under the same regulations as interstate commerce. This distinction is crucial because interstate commerce deals with economic interactions that span multiple states, creating a need for federal oversight to maintain an equitable trade system across state boundaries.

Similarly, the options focusing solely on national waterways or transportation by rail represent specific modes of transport or contexts rather than encompassing the broader concept of interstate commerce. The essence of interstate commerce lies in its cross-border nature, making the transportation of goods or persons between states the most accurate definition.