Strauder v. West Virginia (1880):

West Virginia law limited jury service to "white male persons, who are twenty-one years of age and not over sixty, and who are citizens of this State."

Supreme Court opinion:

1. It was designed to assure to the colored race the enjoyment of all the civil rights that under the law are enjoyed by white persons, and to give to that race the protection of the general government, in that enjoyment, whenever it should be denied by the States.

2. It ordains that . . . the law in the States shall be the same for the black as for the white . . . and, in regard to the colored race, for whose protection the amendment was primarily designed, that no discrimination shall be made against them by law because of their color . . .

That the West Virginia statute respecting juries . . . is such a discrimination ought not to be doubted. Nor would it be if the persons excluded by it were white men. . . . Nor if a law should be passed excluding all naturalized Celtic Irishmen, would there be any doubt of its inconsistency with the spirit of the amendment. The very fact that colored people are singled out and expressly denied by a statute all right to participate in the administration of the law, as jurors, because of their color, though they are citizens, and may be in other respects fully qualified, is practically a brand upon them, affixed by the law, an assertion of their inferiority, and a stimulant to that race prejudice which is an impediment to securing to individuals of the race that equal justice which the law aims to secure to all others.

Plessy v. Ferguson (1896):

1. 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.

2. So far, then, as a conflict with the Fourteenth Amendment is concerned, the case reduces itself to the question whether the statute of Louisiana is a reasonable regulation, and, with respect to this, there must necessarily be a large discretion on the part of the legislature. In determining the question of reasonableness, it is at liberty to act with reference to the established usages, customs, and traditions of the people, and with a view to the promotion of their comfort and the preservation of the public peace and good order.

3. 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 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.

4. Justice Harlan's dissenting opinion: Our constitution is color-blind, and neither knows nor tolerates classes among citizens. In respect of civil rights, all citizens are equal before the law. The humblest is the peer of the most powerful. The law regards man as man, and takes no account of his surroundings or of his color when his civil rights as guaranteed by the supreme law of the land are involved.

Korematsu v. United States (1944):

It should be noted, to begin with, that all legal restrictions which curtail the civil rights of a single racial group are immediately suspect. That is not to say that all such restrictions are unconstitutional. It is to say that courts must subject them to the most rigid scrutiny. Pressing public necessity may sometimes justify the existence of such restrictions; racial antagonism never can.

Brown v. Board of Education of Topeka (1954):

To separate them from others of similar age and qualifications solely because of their race generates a feeling of inferiority as to their status in the community that may affect their hearts and minds in a way unlikely ever to be undone.

Loving v. Virginia (1967):

At the very least, the Equal Protection Clause demands that racial classifications, especially suspect in criminal statutes, be subjected to the "most rigid scrutiny," Korematsu v. United States, 323 U. S. 214, 216 (1944), and, if they are ever to be upheld, they must be shown to be necessary to the accomplishment of some permissible state objective, independent of the racial discrimination which it was the object of the Fourteenth Amendment to eliminate.