Homer Plessy was arrested after he refused to leave the whites-only section of a Louisiana railcar, even though he was actually seven-eighths white. Plessy hoped to build a test case around his arrest, and he sued the state of Louisiana, contending that its law separating whites and blacks on railroad cars violated the equal protection clause of the Fourteenth Amendment. In the decision in Plessy v. Ferguson, Justice Henry Billings Brown laid the underpinnings for the Jim Crow segregation that would dominate the South until the 1960s.

MR. JUSTICE BROWN, after stating the case, delivered the opinion of the court.

This case turns upon the constitutionality of an act of the General Assembly of the State of Louisiana, passed in 1890, providing for separate railway carriages for the white and colored races. . . . The constitutionality of this act is attacked upon the ground that it conflicts both with the Thirteenth Amendment of the Constitution, abolishing slavery, and the Fourteenth Amendment, which prohibits certain restrictive legislation on the part of the States.

The object of the amendment was undoubtedly to enforce the absolute equality of the two races before the law, but, in the nature of things, it could not have been intended to abolish distinctions based upon color, or to enforce social, as distinguished from political, equality, or a commingling of the two races upon terms unsatisfactory to either. Laws permitting, and even requiring, their separation in places where they are liable to be brought into contact do not necessarily imply the inferiority of either race to the other, and have been generally, if not universally, recognized as within the competency of the state legislatures in the exercise of their police power. The most common instance of this is connected with the establishment of separate schools for white and colored children, which has been held to be a valid exercise of the legislative power even by courts of States where the political rights of the colored race have been longest and most earnestly enforced. . . .

It is claimed by the plaintiff in error that, in any mixed community, the reputation of belonging to the dominant race, in this instance the white race, is property in the same sense that a right of action or of inheritance is property. Conceding this to be so for the purposes of this case, we are unable to see how this statute deprives him of, or in any way affects his right to, such property. If he be a white man and assigned to a colored coach, he may have his action for damages against the company for being deprived of his so-called property. Upon the other hand, if he be a colored man and be so assigned, he has been deprived of no property, since he is not lawfully entitled to the reputation of being a white man.

In this connection, it is also suggested by the learned counsel for the plaintiff in error that the same argument that will justify the state legislature in requiring railways to provide separate accommodations for the two races will also authorize them to require separate cars to be provided for people whose hair is of a certain color, or who are aliens, or who belong to certain nationalities, or to enact laws requiring colored people to walk upon one side of the street and white people upon the other, or requiring white men’s houses to be painted white and colored men’s black, or their vehicles or business signs to be of different colors, upon the theory that one side of the street is as good as the other, or that a house or vehicle of one color is as good as one of another color. The reply to all this is that every exercise of the police power must be reasonable, and extend only to such laws as are enacted in good faith for the promotion for the public good, and not for the annoyance or oppression of a particular class. . . .

Gauged by this standard, we cannot say that a law which authorizes or even requires the separation of the two races in public conveyances is unreasonable, or more obnoxious to the Fourteenth Amendment than the acts of Congress requiring separate schools for colored children in the District of Columbia, the constitutionality of which does not seem to have been questioned, or the corresponding acts of state legislatures.

We consider the underlying fallacy of the plaintiff’s argument to consist in the assumption that the enforced separation of the two races stamps the colored race with a badge of inferiority. If this be so, it is not by reason of anything found in the act, but solely because the colored race chooses to put that construction upon it. The argument necessarily assumes that if, as has been more than once the case and is not unlikely to be so again, the colored race should become the dominant power in the state legislature, and should enact a law in precisely similar terms, it would thereby relegate the white race to an inferior position. We imagine that the white race, at least, would not acquiesce in this assumption. The argument also assumes that social prejudices may be overcome by legislation, and that equal rights cannot be secured to the negro except by an enforced commingling of the two races. We cannot accept this proposition. If the two races are to meet upon terms of social equality, it must be the result of natural affinities, a mutual appreciation of each other’s merits, and a voluntary consent of individuals. . . . Legislation is powerless to eradicate racial instincts or to abolish distinctions based upon physical differences, and the attempt to do so can only result in accentuating the difficulties of the present situation.

Source: Plessy v. Ferguson, 163 U.S. 537 (1896).