The United States brought an appeal against William Gibson and the Heirs of Francis P. Fatio, Deceased. The case involved a dispute over land in Florida that was granted to the heirs by Spain before it ceded control of the territory to the United States in 1821. The Supreme Court held that while Spain had no right to grant lands within its territories after 1810, when Congress passed legislation prohibiting such grants, this particular grant was valid because it predated both Spanish and American law on this issue. Furthermore, since there were no laws at the time preventing foreign governments from granting lands within their own borders prior to cession or transfer of sovereignty, any such grants would be considered valid under international law as well as U.S domestic law once they are recognized by treaty or other agreement between two nations. Therefore, despite being made after 1810 but before cession of power in 1821, this particular grant was found valid and binding upon all parties involved due to its recognition through treaty with Spain's successor government -the United States- thus affirming ownership rights for those named beneficiaries under Spanish rule prior to transferral of authority from one nation state another

In the United States v. William Gibson et al., Heirs of Francis P. Fatio, Deceased, the Supreme Court was asked to decide whether a patent issued by Spain in 1790 for land located within what is now Florida could be enforced against subsequent purchasers from the United States government after it acquired title to that same land through treaty with Spain in 1819. The majority opinion held that such patents were not enforceable because they had been superseded by later laws and treaties between nations which took precedence over earlier grants made by foreign governments prior to cession of territory or acquisition of sovereignty over it. However, Justice McLean dissented on this point and argued that while he agreed with much of the reasoning behind the majority's decision, he felt there should have been an exception made for those who purchased lands under Spanish patents before any change in ownership occurred as these individuals would have acted upon their rights in good faith without knowledge or notice of any conflicting claims arising out of subsequent changes in territorial control or sovereignty.