Answer: Maritime expansion
Explanation:
The Treaty of Versailles caused long-term instability in Europe (and parts of Asia) by ignoring the nations who had lost WWI. The treaty didn't provide any support for the nations who had lost, creating resentment in the hearts' of their people. This disunity allowed for the rise of facist dictators post-WWI, eventually causing World War II.
The Civil Rights Act of 1875 outlawed discrimination in public facilities, but it was declared unconstitutional in 1883 by the Supreme Court. In the 1896 case of Plessy v.s. Ferguson, the verdict that separate but equal was constitutional led to the creation of Jim Crow laws that segregated businesses and public places.
Labor mobility. In markets, supply is represented by companies while demand is represented by customers. Its not the demand of the product that pays, it is the skill set of the employees that determines the their degree of pay. If you ask yourself why a retail sales person is paid less than a doctor, you will obviously note that the difference in their pay is their skill. Businesses look for profits, and skilled workers drive profitability high hence they get to be paid more than low skilled workers.
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