Before 1942, American children pledged allegiance to the flag with the Bellamy Salute so named after Francis Bellamy who wrote the pledge of allegiance in 1892. Worried that it might be confused with the Nazi's Roman salute, Congress changed the salute to simply placing a hand over the heart.
On September 8, 1892, Francis Bellamy’s Pledge of Allegiance was published in "The Youth’s Companion" magazine to promote patriotism among children. The Pledge of Allegiance was honored on this stamp in 1992, to celebrate its centennial. https://www.mysticstamp.com/info/this-day-in-history-september-8-1892/