Hello
the real answer to this questions is, A. prove the legitimacy of dynastic rule
Answer:
Arguably the most profound effect of World War I on African Americans was the acceleration of the multi-decade mass movement of black, southern rural farm laborers northward and westward to cities in search of higher wages in industrial jobs and better social and political opportunities.
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It is a, political because those are all political stand points
International trade enables specialization, which brings increased efficiency and greater competition to spur the market.
This happens because Specialization would make each nation to focus on producing certain type of products in which they would gain a competitive advantage towards other (either because they had the necessary materials sources or labor qualities) and would create better and cheaper product in the market.
I believe it was fewer regulations, and lower taxes :) I hope this helps!