Justice McLean agreed that the conviction must be reversed, but he wrote separately to give a more detailed account of federal judicial authority and the constitutional basis for protecting Worcester. He stressed that section 25 applies to criminal as well as civil cases, because a federal court must be able to protect a person’s liberty, character, and life when a state prosecution conflicts with federal law.
He described the Cherokee people as a domestic, rather than foreign, community possessing self-government and a protected right of occupancy. Although he regarded the ultimate title to the soil as residing in the government, he concluded that the Cherokees retained enforceable rights to possess their territory and govern their internal affairs unless and until those rights were lawfully extinguished.
McLean reasoned that Congress’s power to regulate commerce with Indian tribes included the authority to regulate intercourse between United States citizens and self-governing Indian communities. The 1802 Intercourse Act therefore applied to the Cherokee Nation; its exception for Indians surrounded by state settlements and within a state’s ordinary jurisdiction did not describe the Cherokees.
He acknowledged Georgia’s serious grievance that the United States had promised in the 1802 cession agreement to obtain Indian title peacefully and on reasonable terms. But that political dispute could not authorize Georgia to disregard treaties and statutes still in force. He also viewed Cherokee self-government within a state as potentially temporary: if a tribe lost the capacity for self-government, state protection might eventually become necessary. That contingency, however, did not exist here.