I have chose primary source to be the answer. Check out the definition of "primary source." secondary wouldn't make sense here.
I believe the answer is: "African Americans increased their push for civil rights on the home front"
The sentiment was initially made by African Americans who were being blatantly discriminated by the white citizens, in both job fields, education, or even the usage of public properties. This became the reason for the push for civil rights which finally realised by the The Civil Rights Act of 1964
The United Nations, because after World War ll the allies created the United Nations to keep international cooperation and diplomacy in an attempt to prevent a third world war