The case you are looking for is Marbury vs Madison
Answer:
OPEC can be observed as a trade barrier because it could hypothetically completely exclude a country from trading with countries that produce oil and this would make life much harder for those countries. For example, OPEC introduced an embargo on the US in 70s and there was a huge spike in gas prices and a shortage of fuel.
Explanation:
The correct answer is Greenback.
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The American Expeditionary Force was commanded by General John J. Pershing. This force helped the Allied forces tremendously during World War I. These US forces helped a variety of countries from 1917-1919 including countries like Great Britain, France, Italy, and Canada. This group of 2 million men served bravely and was officially disbanded as of 1920.
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