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38 Though that case spoke of historic trust obligations, it arose from an explicit promise to create a trust with $500,000. There is little reason to view such cases as expanding Congress’ powers.

Accordingly, the context of all these cases points to lines that are at least plausibly rooted in Founding-era practices and the text of the Constitution. See Brown v. Davenport, 596 U. S. ___, ___–___ (2022) (slip op., at 20–21) (judicial opinions must be taken in context, not read like statutes). Congress can regulate commerce with Indian tribes; it may be able to regulate tribal governments and lands in Kagama’s vein; and it can make treaties, dispose of federal funds, and establish discrete trusts.

ICWA does not remotely resemble those practices. It does not regulate commerce, tribal governments, or tribal lands. Nor is it based on treaties, federal funds, or any discrete trust. By regulating family-law matters of citizens living