What is the definition of selfsame sovereignty.

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"such has been the patient suffrence of these colonies; and such is now the necessity which constrains them to after their former systems of government. the history of the present king of great britain is a history of reapeated injuries and usurpations, all having in direct object the establishedment of an absolute tyranny over these states." which statement best describes the excerpt

According to warren in the brown opinion, how did conditions change between the time the fourteenth amendment was adopted and the time the supreme court considered brown v. board of education?