It was created in the 1890s specifically to be said by children in school every Columbus Day by Presidential proclamation. The words "United States of America" were not present. While giving their pledge, the students were required to give a straight-armed Nazi-style salute to the flag. After World War I, "United States of America" was added to the pledge. In the 1940s, it was not compulsory for children to state the oath anymore. Also, the Nazi-style salute (thanks to US entry in WWII) was replaced with a simple hand over the heart. In the 1950s, the words "under God" was added to the pledge. The pledge is now said every morning by children in US classrooms, though participation is not mandatory.