Petitions are those in which inmates may collaterally challenge their convictions (after exhausting all available state remedies to do so) by arguing that their trial was constitutionally defective.

I believe the answer is: Habeas corpus

Habeas corpus petition would eventually develop into a legal battle between the  states vs the defendants, and would be considered to be a civil class action. This type of petittion usually occurs when there is a proof that a certan legal departement is abusing its power of there is a new development regarding an interpretation of law.

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.