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:
W.E. B. Du Bois challenged Booker T. Washington because <span>Washington utilized violent protests to try and gain more rights for African Americans while Du Bois wanted to use peaceful demonstrations.
</span>
I belive the answer is Feudalism. It was used in Medievaltimes.
Legalism is a Classical Chinese philosophy that emphasizes
the need for order above all other human concerns. <span>The Legalists believed that government could
only become a science if rulers were not deceived by pious, impossible
ideals such as "tradition" and "humanity."
</span>
