The answer is D , the inner cities lost revenue and began to economically decline
Austro-Hungarian Empire
The Austro-Hungarian Empire collapsed after World War I, and the subsequent Treaty of Trianon established Hungary's current borders, resulting in the loss of 71% of its territory, 58% of its population, and 32% of ethnic Hungarians.
Freed African American faced a myriad of problems.
They had to find jobs, they suffered from inequality in civil and political rights, they frequently faced stiff opposition from whites and they had accommodation problems.
<h3>Emancipation Proclamation </h3>
During the third year of the American civil war, President Abraham Lincoln issued the Emancipation Proclamation.
The proclamation declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free"
After the Proclamation, some slaves fled from their owners and started a new life. Others decided to stay back but they received wages for their work.
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The two consequences of the California Gold Rush is it had an severe environmental impact. Another consequence was the rivers were clogged with sediment.