In the 1902 case of Hanley v. Kansas City Southern Railway Company, the U.S Supreme Court was tasked with determining whether a state court could exercise jurisdiction over an out-of-state defendant in a personal injury lawsuit. The plaintiff, Hanley, was injured while working for the railway company in Indian Territory (now Oklahoma) and sued for damages in Missouri where he resided. The railway company argued that since it was incorporated under Kansas law and had its principal place of business there, Missouri courts lacked jurisdiction to hear the case. The Supreme Court disagreed with this argument and upheld the lower court's decision to allow Hanley's suit to proceed in Missouri. It ruled that corporations were not immune from being sued outside their home states if they conducted substantial business elsewhere - as long as due process rights were respected by providing adequate notice and opportunity to defend against charges. This ruling established important precedent regarding corporate liability across state lines which continues to influence American jurisprudence today.

In the dissenting opinion for Hanley v. Kansas City Southern Railway Company, it was argued that the majority's decision to uphold a state statute requiring railroads to provide separate but equal accommodations for white and black passengers violated the Fourteenth Amendment of the U.S. Constitution. The dissenting justices believed that this law promoted racial discrimination by enforcing segregation based on race, which they saw as inherently unequal treatment under any circumstances. They contended that such laws were not only morally wrong but also unconstitutional because they denied African American citizens their right to equal protection under the law. Furthermore, they disagreed with the majority's assertion that these laws were necessary for maintaining peace and order in society, arguing instead that true social harmony could only be achieved through mutual respect and equality among all citizens regardless of their race or color.