The United States v. Chaboya was a Supreme Court case in which the defendant, Chaboya, had been convicted of murder and sentenced to death by hanging. The court found that the trial judge had erred in allowing evidence from an Indian witness who did not understand English or Spanish, as well as other witnesses whose testimony was hearsay. Furthermore, it held that the jury instructions were inadequate because they failed to explain how circumstantial evidence should be weighed against direct evidence. Ultimately, the Supreme Court reversed Chaboya's conviction on grounds of insufficient proof beyond a reasonable doubt and remanded for further proceedings consistent with its opinion. This decision established important precedent regarding due process rights during criminal trials involving non-English speaking defendants and clarified when circumstantial evidence can be used to prove guilt beyond a reasonable doubt.

In The United States v. Chaboya, the Supreme Court was tasked with deciding whether a Mexican citizen who had been living in California since 1851 and had become a naturalized American citizen in 1860 could be convicted of an offense committed before he became a citizen. Justice Field delivered the dissenting opinion, arguing that Chaboya should not have been found guilty because his conviction violated both the letter and spirit of the Treaty of Guadalupe Hidalgo between Mexico and America which ended their war in 1848. He argued that under this treaty all Mexicans residing within what is now California were to be considered citizens of Mexico until they chose to become citizens or subjects of some other government, such as America's. As such, Field concluded that Chaboya should not have been held accountable for any crime committed prior to becoming an American citizen because at that time he was still subject only to Mexican law.