In the case of Prosser v. Finn, 1907, the United States Supreme Court was tasked with determining whether a certain piece of land in California belonged to Mrs. Prosser or Mr. Finn under Spanish and Mexican law grants dating back to before California became part of the U.S. The court examined two separate grants: one from Governor Micheltorena to Julian Workman in 1843 and another from Governor Pio Pico to F.P.F Temple in 1846 for Rancho La Merced lands which overlapped each other partially. The court ruled that both these grants were valid but they had different boundaries due to errors made by officials during their original demarcation process; hence there was no overlap between them as claimed by Mrs. Prosser who based her claim on Workman's grant while Mr. Finn relied on Temple's grant. The decision hinged largely upon historical documents including maps, surveys, testimonies from old residents and even an act passed by Congress recognizing certain claims arising out of Spanish/Mexican laws relating to public lands within territories ceded by Mexico under Treaty of Guadalupe Hidalgo (which ended Mexican-American War). Ultimately it held that Mr.Finn owned disputed tract since his title derived directly from recognized grantee (Temple) whose rights superseded those granted earlier but not confirmed until later date.

In the dissenting opinion for Prosser v. Finn, the justice disagreed with the majority's interpretation of whether a state law was in conflict with federal bankruptcy laws. The justice argued that there was no direct conflict between the two sets of laws and therefore, it wasn't necessary to declare one superior over another. They believed that both could coexist without infringing on each other’s jurisdiction or undermining their respective objectives. Furthermore, they contended that states should have some autonomy in deciding how to handle matters related to insolvency within their borders as long as they don’t directly contradict federal legislation or impede its execution. Thus, according to this view, declaring state law invalid due to supposed inconsistency with federal law seemed an unwarranted intrusion into states' rights and a misinterpretation of dual sovereignty principles inherent in American Federalism.