## Facts

- Foster and Elam sued to recover possession of land in the Feliciana district east of the Mississippi River, claiming title through a chain of conveyances from a Spanish grant made in 1804 and later approved by Spanish authorities.
- Neilson possessed the land and contended the Spanish grant was invalid because Spain lacked authority to grant land in that territory after earlier cessions associated with Louisiana.
- The territorial status of the area between the Iberville and Perdido rivers was disputed following the 1800 Treaty of San Ildefonso and the 1803 Louisiana Purchase; the United States and Spain asserted competing boundary interpretations.
- Foster and Elam also relied on a provision in the 1819 U.S.–Spain treaty (ratified in 1821) stating certain Spanish grants “shall be ratified and confirmed” by the United States.
- The U.S. District Court for the Eastern District of Louisiana dismissed the petition on the ground that the pleadings showed no valid title.
- Foster and Elam sought Supreme Court review by writ of error.

## Issues

1. Whether U.S. courts must accept the political branches’ asserted construction of territorial treaties and sovereignty over the disputed region when adjudicating private land titles derived from foreign grants.
2. Whether the 1819 U.S.–Spain treaty clause providing that certain Spanish land grants “shall be ratified and confirmed” is self-executing and judicially enforceable without congressional implementation.
3. Whether a Spanish land grant made after the asserted transfer of sovereignty could be recognized as valid in a U.S. court.

## Decision

- The Supreme Court affirmed the dismissal of the action.
- The Court treated the United States’ asserted sovereignty over the disputed territory, as expressed and acted upon by the political branches, as controlling for judicial decision.
- The Court held the relevant 1819 treaty language was non-self-executing and did not itself validate the claimed Spanish grant absent implementing legislation.
- Because the Spanish grant could not be sustained under the controlling view of sovereignty and the treaty provision did not operate as domestic law, plaintiffs failed to state a recoverable title.

## Legal Principles

- Treaties are generally judicially cognizable as “law of the land” when their terms operate directly without additional legislative action.
- A treaty provision is non-self-executing when its text indicates a promise or contract requiring future action by the political branches; courts cannot enforce such a provision until Congress executes it through legislation.
- Where the political branches have unequivocally asserted and exercised sovereign authority over territory and legislated on that basis, courts will not adopt a contrary construction of the governing territorial arrangements in domestic adjudication.
- Private claims to land derived from foreign sovereign grants may fail when the granting sovereign is treated as lacking authority over the territory at the time of the grant and no self-executing treaty provision supplies a domestic legal basis to validate the grant.

## Conclusion

The Court refused to enforce a treaty promise of future confirmation as an immediate rule for courts and, deferring to the political branches’ territorial construction and asserted sovereignty, affirmed dismissal of a claim based on a Spanish land grant made after the asserted transfer of authority.


Foster & Elam v. Neilson, 27 U.S. (2 Pet.) 253 (1829)