The Thames was a Supreme Court case that dealt with the issue of maritime jurisdiction. The case involved a dispute between the United States and Great Britain over the ownership of a ship called the Thames. The United States claimed that the ship was owned by a British citizen, while Great Britain argued that the ship was owned by an American citizen. The Supreme Court ultimately ruled in favor of the United States, finding that the ship was owned by an American citizen and thus subject to American jurisdiction. The case was significant because it established the principle that a ship's nationality is determined by the nationality of its owner. This principle has since been applied to other areas of maritime law, such as the determination of a ship's flag state and the application of international maritime conventions. The case also established the principle that a ship's nationality is determined by the nationality of its owner, regardless of the ship's actual location. This principle has been applied to other areas of maritime law, such as the determination of a ship's flag state and the application of international maritime conventions. The Thames case is an important precedent in the field of maritime law and has been cited in numerous subsequent cases. It is a reminder that a ship's nationality is determined by the nationality of its owner, regardless of the ship's actual location. This principle has been applied to other areas of maritime law, such as the determination of a ship's flag state and the application of international maritime conventions.

In the case of The Thames, the Supreme Court was tasked with determining whether a vessel owned by citizens of one country and sailing under its flag could be seized in another country's waters for violating that nation's laws. In a 5-4 decision, the majority opinion held that such seizures were permissible as long as they did not violate international law or treaties between nations. However, Justice Field dissented from this ruling on two grounds: firstly, he argued that it violated principles of comity among nations; secondly, he argued that it would lead to an increase in arbitrary seizures and arrests without due process protections. He concluded his dissent by stating "The right to seize upon vessels within neutral waters is so dangerous to peaceable commerce…that I am unwilling to admit its existence."