What is contained in Section 51 of the Constitution?

Section 51 of the Australian Constitution outlines the legislative powers of the Parliament, specifying areas in which it can make laws. It lists various subjects, including trade and commerce, taxation, defense, Immigration, and external affairs, among others. This section serves as a foundation for federal legislative authority, allowing the Commonwealth to enact laws on matters of national significance. Additionally, it allows for the potential expansion of federal powers through the interpretation of these subjects by the High Court.