Although many people feel that expectations for personal space (usually about 18 inches for americans) are innate, members of many cultures are used to noticeably lesspersonal space than we are, which to demonstrate that our expectations for personal space are: a. the direct result of hormonal differences in the limbic systemb. usually negotiable and not all that hard to changec. a part of our culture and as such are learned, rather than innated. very difficult to measure accurately

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.

answer; george herbert mead;