In 1952 vs In 1952,

grammaticality

Solution 1:

Because "In 1952" is an introductory prepositional phrase, you may use a comma after the end of it and before the rest of the sentence. According to Purdue OWL, a comma is recommended for longer prepositional phrases. Either choice is technically correct.

https://owl.purdue.edu/owl/general_writing/punctuation/commas/commas_after_introductions.html

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