Final answer:
The given reference does not provide information about the number of Pike Chapters nationwide. More context is needed to answer the question.
Step-by-step explanation:
The number of Pike Chapters in the U.S. is not provided in the given reference.
The information provided only lists numbers for various publications, such as New Republic, New York Times, and New Yorker.
Unfortunately, without more context, it is not possible to determine the number of Pike Chapters nation-wide.