Which of the following principles was included in most state constitutions?

a. separation of powers
b. judicial review
c. parliamentary structure
d. popular sovereighnty

I believe the answer is: D. Popular Sovereignty

Popular sovereignty refers the principle of government which ruled by the will from the majority of the people.

In democratic country such as united states (and most of the countries in western hemisphere) , this would be included in most state constitutions.

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.