Which event occurred during the paleozoic era? pangaea began to break apart into many continents separated by shallow seas. cyanobacteria filled the water and air with oxygen. early humans began to make tools, harvest plants, and make cave paintings. pangaea, the super continent, was formed.

pangaea began to break up into many contents separated by shallow seas

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.