What were the political and economic achievements of the roman empire at its height

Even as the empire expanded, all important political decisions for the empire were still made in Rome, and the city itself grew and changed with its empire. ... The ability to collect taxes in currency, growth of economic production and trade, and military victories all provided funds for building projects in Rome.

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.