In the case of the State Tax on Foreign-Held Bonds, Railroad Company v. Pennsylvania, the Supreme Court of the United States was asked to decide whether a state could impose a tax on bonds held by foreign investors. The Railroad Company argued that the tax was unconstitutional because it violated the Contract Clause of the United States Constitution, which prohibits states from passing laws that impair the obligation of contracts. The Supreme Court held that the tax was constitutional because it did not interfere with the contractual obligations of the bondholders. The Court reasoned that the tax was a legitimate exercise of the state's power to tax and did not interfere with the contractual obligations of the bondholders. The Court also noted that the tax was not discriminatory and did not favor one class of bondholders over another. The Court concluded that the tax was a valid exercise of the state's power to tax and did not violate the Contract Clause of the United States Constitution.

In the case of Railroad Company v. Pennsylvania, the Supreme Court was asked to decide whether a state tax on foreign-held bonds violated the Constitution's Contract Clause. The majority opinion held that it did not violate this clause because states have broad authority to impose taxes for public purposes and there is no evidence that such a tax would impair any contractual obligations between bondholders and their creditors. However, Justice Field dissented from this decision, arguing that while states do indeed possess some power to levy taxes in order to raise revenue for public purposes, they cannot use taxation as an instrument of oppression or injustice against individuals or corporations who are protected by contract rights under federal law. He argued further that if allowed unchecked, such taxation could be used as a means of punishing those with whom one disagrees politically or economically without due process protections afforded by other branches of government.