In West Wisconsin Railway Company v. Board of Supervisors of Trempealeau County, the Supreme Court of the United States was asked to decide whether a county could tax a railroad company for the privilege of operating within its borders. The railroad company argued that the tax was unconstitutional because it was a direct tax on the company's property, which was prohibited by the Constitution. The county argued that the tax was a valid exercise of its taxing power. The Supreme Court held that the tax was unconstitutional because it was a direct tax on the company's property. The Court reasoned that the tax was a direct tax because it was imposed on the company's property, rather than on the company's activities. The Court also noted that the tax was not apportioned among the states, as required by the Constitution. The Court concluded that the tax was unconstitutional and that the county could not impose it on the railroad company. The Court's decision established that direct taxes on property are prohibited by the Constitution and must be apportioned among the states.

In West Wisconsin Railway Company v. Board of Supervisors of Trempealeau County, the Supreme Court was tasked with determining whether a county could tax railway companies for their property and franchises within its borders. The majority opinion held that counties had no authority to impose such taxes on these entities, as it would be in violation of the federal government’s exclusive power over interstate commerce. Justice Field dissented from this ruling, arguing that while Congress has broad powers over interstate commerce, they do not extend so far as to prevent states or local governments from taxing private corporations operating within their jurisdictions. He further argued that if state and local governments were prevented from imposing taxes on these entities then they would lack any means by which to raise revenue necessary for public works projects like roads and bridges needed by those same businesses in order to conduct business across state lines. As such he concluded that Congress did not intend for its power over interstate commerce to supersede the right of states or localities to levy taxes upon private corporations operating within them when doing so does not interfere with congressional regulation of said commerce