I’m not sure but I think option D;
To help Americans build their own fallout shelters
Explanation:
United States civil defense refers to the use of civil defense in the history of the United States, which is the organized non-military effort to prepare Americans for military attack.
The answer is D.
Tang Dynasty believed that creating a body of career official with no territorial or power base would prevent destabilizing consequences. Thus, the dynasty selected the scholar-officials through civil service examinations.
That would be the principal of federalism
The only remaining structure associated with the 7 Wonders of the Ancient World is the Great Pyramid in Giza.
