After frank palko was sentenced to death by the state of connecticut the supreme court ruled

In order to prevent the double jeopardy, the decision to sentence Frank Palko to death by the state of Connecticut was upheld by the Supreme Court.

Explanation:

Within this the case Palko v. Connecticut (1937) the Fifth Amendment protection was applied in order to protect Frank Palko against double jeopardy. This happened because, Palko was charged with first-degree murder, while he was convicted for a second-degree murder. Former would have led to the death sentence, meanwhile latter to the life imprisonment. Palko was ultimately executed for the 1938 for committing the double first-degree murder.

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 answer to your question is,

old stone age.

-mabel < 3