In United States v. San Jacinto Tin Company, the United States Supreme Court addressed the issue of whether the United States could bring a suit against a private party for damages caused by a breach of contract. The case involved a contract between the United States and the San Jacinto Tin Company for the purchase of tin ore. The United States alleged that the company had breached the contract by failing to deliver the ore as promised. The company argued that the United States could not bring a suit against it because the contract was not made under the authority of the United States. The Supreme Court held that the United States could bring a suit against the company for breach of contract. The Court reasoned that the contract was made under the authority of the United States and that the United States had the right to bring a suit for damages caused by the breach. The Court also noted that the United States had the right to bring a suit against a private party for breach of contract, even if the contract was not made under the authority of the United States. In conclusion, the Supreme Court held that the United States could bring a suit against the San Jacinto Tin Company for breach of contract. The Court reasoned that the contract was made under the authority of the United States and that the United States had the right to bring a suit for damages caused by the breach.

In United States v. San Jacinto Tin Company, the Supreme Court was asked to decide whether a federal statute that required certain companies to pay taxes on their income applied retroactively. The majority opinion held that the statute did apply retroactively and thus upheld the lower court's decision in favor of the government. However, Justice Field dissented from this ruling and argued that Congress had not intended for such a law to be applied retrospectively. He reasoned that if Congress wanted it to have retrospective effect, they would have explicitly stated so in its language or provided some other indication of intent. Furthermore, he noted how applying laws retroactively could lead to unfair results as individuals may not be able anticipate what future legislation will require them do with respect to past actions or transactions; therefore, any ambiguity should be resolved against making a law applicable retrospectively unless there is clear evidence of congressional intent otherwise.