In the United States Supreme Court case of The United States v. Jose Castro and Others, the court was asked to decide whether a Mexican citizen who had been living in California since 1845 could be considered an inhabitant of that state for purposes of naturalization under federal law. The appellants argued that because he had not declared his intention to become a citizen until after California became part of the United States, he should not be allowed to apply for citizenship. However, the respondents countered by arguing that they were residents prior to annexation and thus qualified as inhabitants under federal law. After considering both sides’ arguments, the court ultimately ruled in favor of Castro and others by finding them eligible for naturalization due to their long-term residence in California before it became part of America. This ruling established important precedent regarding residency requirements for those seeking U.S citizenship through naturalization processes at any time thereafter

In the United States v. Jose Castro and Others, the Supreme Court was tasked with determining whether or not a group of individuals had been lawfully arrested by US forces in Mexico during an expedition against hostile Indians. The majority opinion held that since they were taken from Mexican soil without permission, their arrest was unlawful and thus violated international law. However, Justice Grier dissented on this point arguing that while it is true that such arrests would be illegal under normal circumstances, these particular individuals were part of a larger group who had committed acts of hostility against US forces which justified their arrest as lawful combatants according to both domestic and international laws. He further argued that even if one assumed for argument's sake that the arrests were unlawful due to lack of consent from Mexico, then any damages incurred should be paid out by the United States rather than those responsible for making said arrests as they acted within reason given the situation at hand.