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February 1962 , President Kennedy proclaimed an embargo on  the trade between the United States and Cuba.

Reasoning for the U.S. placing an embargo on exports to cuba for food and medicine because Cuba nationalized the US owned Cuban oil refineries without compensation

Cuba was effected by facing shortages of basic goods and the economy declined by 11%.

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2017 September 21th the executive order 13810 was ordered which let the U.S. to cut its financial system or freeze any companies or assets , organizations, and trading goods , services, and technology with North Korea.

The reason for this is because North Korea conducted nuclear tests so sanctions were focused on trade bans on weapons related materials.

Effects on north korea was the impact on their population and on their food causing delays in the arrival fo food aid and humanitarian.

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August 2011, The U.S. placed an embargo on the oil sector and freezing the financial assets of the Syrian state itself.

The main reason for economic sanctions on Syria is because the result of repression of civilians in the Syrian civil war from 2011.

Effects of that resulted in the Syrian nation being deprived of $107 billion in oil and gas earning.

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The U.S. has had Iran sanctions since 1970

Reasons for this is because the controversies around Iranian nuclear program.

It effected the economy and the medicine and raw materials for Iranian and there pharmaceutical companies.

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In 2014 sanctions were imposed on Crimea prohibiting exports of goods and services to the region

Reasons for this is because of Russias illgeal occupation and attempted annexation of Crimea .

effects were the ruble fell and its trades were in 60-70 range.