By the end of the 1970s, the country of vietnam could best be described as a) unified under a democratic government. b) unified under a communist government. c) divided among democratic and communist governments. d) divided among colonial powers, mainly china and korea.

The answer is B because the South Vietnamese surrendered on April 30, 1975.

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;

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.