Which of these ideas would supporters of the Plessy v. Ferguson ruling most likely have agreed with? O that “social rights" were a part of "civil rights"
O that the Constitution should be interpreted without regard to race
O that "separate but equal" was a valid legal doctrine
O that "separate but equal" did not justify racial segregation

The ideas which supporters of the Plessy v. Ferguson ruling would most likely have agreed with is: C. that "separate but equal" was a valid legal doctrine.

The Fourteenth (14th) Amendment is made up of a clause referred to as the equal protection of the laws and it states and guarantees that no state or local government shall make or enforce any law which would contravene the rights, privileges, or immunities of all persons born or naturalized in the United States of America.

Plessy v. Ferguson was a landmark case between Homer A. Plessy and John H. Ferguson, in which the justices of the Supreme Court unanimously ruled (7 to 1) on the 18th of May, 1896 that racial segregation laws for public facilities didn't violate the "separate but equal" clause of the Fourteenth (14th) Amendment to the Constitution of the United States of America.

In conclusion, we can deduce that supporters of the Plessy v. Ferguson ruling would most likely agree that "separate but equal" as an idea, was a valid legal doctrine.

Read more on Plessy v. Ferguson here: link

That "separate but equal" was a valid legal doctrine.

Explanation:

Plessy v. Ferguson is a case ruled by the Supreme Court in 1896 and considered a landmark decision in the history of the court. The court was set to determine whether a Louisiana law that required separate compartments for white and black citizens on railroad trains was against the Constitution. It denied this with a seven to one vote and thus declared the provision of separate facilities for whites and blacks to be permissible under certain conditions. Through this judgment, the principle of separate but equal was de facto established as the basis of racial segregation in the southern states.

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

i believe your answer is d)