B. World War l
While white men went off to fight in the war, African Americans moved north for better job opportunities.
Answer:
The US had the strongest Navy and dominated both the Pacific and the Atlantic uncontested; this didn't change throughout the Cold War, even though naval technologies changed a lot (nuclear subs, etc), and the USSR invested heavily in surface and submarine navies.
Explanation:
Justin Yifu Lin is a Chinese economist who is the author of the book "The Quest for Prosperity: How Developing Economies Can Take Off".
In his papers, Lin describes how the China, which many centuries ago was forced to enter a trade with Great Britain after the Opium Wars and was solely seen as a sourcing point, now faces a completely different reality in regards to commercial relations with the British.
The Chinese, whose strength relies on their massive and relatively cheap labor force, understood that the key to development was in acquiring knowledge that would let them thrive in the creation of their own industries. This process has been ongoing throughout the second half of the 20th century until nowadays, as British Enterprises set operations in Chinese Soil, employing Chinese citizens who would eventually benefit from all the knowledge they received. This process has resulted in the creation and incredible growth of global enterprises such as Hayer or Huawei.