In the case of Iowa v. Rood (1902), the U.S Supreme Court dealt with a dispute over taxation and interstate commerce. The state of Iowa had imposed taxes on grain elevators owned by non-residents, including Mr. Rood from Illinois who contested this tax as unconstitutional under the Commerce Clause which prohibits states from interfering with interstate trade. The court ruled in favor of Iowa, stating that while states cannot impose taxes on goods being transported across state lines, they can levy taxes on property within their borders even if it is used for interstate commerce purposes such as grain storage facilities like those owned by Mr.Rood. Therefore, his properties were subject to taxation just like any other real estate within the state's jurisdiction despite its use in facilitating interstate trade.

In the dissenting opinion for Iowa v. Rood, 1902, it was argued that the majority's decision to uphold a tax on an interstate commerce transaction violated the Commerce Clause of the U.S. Constitution. The dissenting justices believed that taxing such transactions could potentially hinder free trade between states and give rise to economic protectionism at state level which would be detrimental to national unity and prosperity. They also expressed concern over potential abuse by states in imposing taxes on out-of-state businesses or individuals engaged in interstate commerce within their borders, thereby creating an unfair advantage for local businesses. Furthermore, they contended that allowing individual states to impose taxes on interstate commerce could lead to double taxation as multiple states may claim jurisdiction over a single commercial transaction crossing several state lines.