[aMorePerfectUnion]

QOVFEFE™

[TEXOKIE]

You guys might be able to find some good images for memes at the WWI National Museum and Memorial in Kansas City:

https://www.theworldwar.org

This one, for instance, caught my eye!
https://theworldwar-prod.s3.amazonaws.com/prod/s3fs-public/styles/imagelist/public/exhibit/WAU_Web.jpg?6HBOTwiy8B13MvRv.7b2KNZlYOWnU7EB&itok=Tldnd8vY