The answer will be D because if there is a purpose behind an issue it can help provide examples and backup.
At least to me
Explanation:
The War's Economic Repercussions. Africa's economy was severely disrupted by the proclamation. In general, the amounts charged for Africa's basic products fell, while the awareness that imported commodities would be in limited supply in the future led to an increase in their costs.
The First World War shattered empires, birthed a slew of new nation-states, sparked separatist movements in Europe's colonies, drove the United States to become a global power, and paved the way for National socialism and Hitler's ascent.
I believe the answer is: Clean air act
Domestic policy was a type of policy that created by one country which only affect that country alone. The clean air act was created in 1963 as a form of environmental law to handle pollution from vehicles and factories in United States only.