How can a nation today get another nation to do something without theatening war?

Trading something they want for it. (In terms of goods AND services)

Explanation:

Say we want China to see us bamboo. We ask China if they will and they say no, but we have a certain kind of flower that China likes to use in their tea. We say, "hey, I will give you 30 trees for 30 bamboo plants."

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.

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