It probably would be.
https://www.copyright.gov/help/faq/faq-duration.html
Do you know how to crop a photo? Maybe just clip the title and the first two lines of the photo and post that under fair use. Then, in the text of your post you can write out the totality of the article.
Do you mean it would be acceptable for the challenge or it would be copyrighted, SJ?
gotta be clear!!
If it was published during WWI, then it is in the public domain and acceptable to post on Wikitree. Anything published in the U.S. prior to 1924 no longer has copyright protection.
https://copyright.cornell.edu/publicdomain