Artist Alex Johnston used a photograph of the flag that flew at Fort Whoop-Up in the late 19th century as the basis for his rendition of the modern American flag. He also used some contemporary written descriptions.
Alex Johnston, the artist, used an old photograph of the flag that was flown at Fort Whoop-Up during a past era as the starting point for his rendition of the modern American flag. Furthermore, he referenced written descriptions from that time to inform his work.