The act of showing purchasers properties only in certain areas on the basis of race, religion, or color rather than economic considerations is called

Steering

Explanation:

According to my research on different Sales techniques, I can say that based on the information provided within the question this type of technique is called Steering. This is when you show a potential client only specific products that you think may appeal to them based on either first impressions or facts about their lives.

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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.