The United States v. Rice was a case heard by the Supreme Court in 1819 that dealt with the issue of whether or not slaves who had been brought into free states were still considered property and could be reclaimed by their owners. The court ruled that they could, as long as it did not violate any state laws prohibiting slavery within those states. This decision established an important precedent for future cases involving fugitive slaves, which would eventually lead to the Fugitive Slave Act of 1850 and other similar legislation throughout the country. The ruling also set a legal standard for determining when someone is legally considered a slave or free person under U.S law, making it clear that even if one moves from one state to another, they are still bound by whatever laws apply in their original place of residence regarding slavery status unless otherwise specified by local statutes or constitutional provisions.

In the United States v. Rice, Chief Justice Marshall delivered a dissenting opinion in which he argued that Congress had no authority to pass laws punishing crimes committed on board of vessels at sea. He reasoned that since the Constitution did not explicitly grant Congress this power, it was reserved for individual states and thus could not be exercised by Congress. Furthermore, he noted that if such a law were allowed to stand then any crime committed anywhere within U.S jurisdiction would be subject to federal prosecution regardless of whether or not it occurred on land or water; this would effectively give Congress unlimited powers over all criminal matters and undermine state sovereignty as well as the separation of powers between different branches of government. In conclusion, Chief Justice Marshall concluded that while there may have been good intentions behind passing such a law, its implications went far beyond what was intended and should therefore be struck down as unconstitutional