In Plessy v. Ferguson (1896), the U. S. Supreme Court established the general principle that: states could use poll taxes and literacy tests to establish voting qualifications.

states could not prevent blacks from voting just because their grandparents had been slaves.

states could require separate accommodations on trains, in schools, and the like, for blacks and whites as long as the accommodations were equal.

Congress could take away a state's seats in the U. S. House of Representatives if the state refused to allow blacks to vote in Congressional elections.

your question is incomplete

explanation:

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.