Riggin v. Magwire was a case heard by the United States Supreme Court in 1872. The case involved a dispute between two parties over a contract for the sale of a steamboat. The plaintiff, Riggin, had contracted with the defendant, Magwire, to purchase a steamboat for $2,000. Magwire had agreed to deliver the boat to Riggin, but failed to do so. Riggin then sued Magwire for breach of contract. The Supreme Court held that Magwire was liable for breach of contract. The Court found that Magwire had failed to fulfill his contractual obligations and that Riggin was entitled to damages. The Court also held that Magwire was liable for the costs of the suit, including attorney's fees. The Court's decision in Riggin v. Magwire established that a party who breaches a contract is liable for damages and costs associated with the suit. This decision has been cited in numerous cases since then, and is still an important precedent in contract law.

In Riggins v. Magwire, the Supreme Court was asked to decide whether a state court had jurisdiction over an action brought by a citizen of one state against another in that same state. The majority opinion held that the suit could be maintained and did not violate any constitutional provision or principle of comity between states. Justice Field dissented from this decision, arguing that it violated both the Constitution and principles of comity between states. He argued that Article IV Section 1 of the Constitution prohibits citizens from suing each other in courts outside their own home states without consent from Congress or permission granted by those other states' legislatures. Furthermore, he noted that such suits were contrary to established principles of comity among sovereigns which require mutual respect for each others’ laws and judicial proceedings as well as recognition and enforcement thereof within their respective jurisdictions unless otherwise prohibited by law or public policy considerations. Therefore, Justice Field concluded that allowing such suits would undermine these important legal concepts upon which our nation is founded on and should not be allowed under any circumstances absent express congressional authorization or permission granted by affected parties’ legislatures