The plessy v. ferguson ruling stated that

Adolf Homer Plessey is a common man in Louisiana who travelled in the First class whites’ car, when the authorities questioned him, he stated that he belonged to the white kinship and refused to occupy the compartment which belonged to blacks.

He was evacuated from the train and jailed. His case was taken up by Ferguson, who stated that the segregation was constitutional as per the doctrine of ‘separate but equal’ and the Separate Car Act was declared following it.  

Separate Car Act ensured that the nonwhites and whites are to be given separate but equal tickets in order to use public facilities.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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d. william mckinley's southern upbringing him win.