Based on the sociological context, the modern-day connection that can be made to the Nationality Act of 1940 is the "process by which immigrants could acquire U.S. citizenship through naturalization."
The Nationality Act of 1940 was done under President Franklin D Roosevelt.
The Act stated the conditions in which people can attain citizenship of the United States either through Birthright or Naturalization.
Hence, in this case, it is concluded that the correct answer is the process by which immigrants could acquire U.S. citizenship through naturalization.
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