The Union flag, referred to as the Stars and Stripes, symbolized team spirit and patriotism

https://collinielv260.talesignal.com/posts/the-legacy-of-civil-war-flags-symbolism-and-design-throughout-history-2

The Union flag, often known as the Stars and Stripes, symbolized cohesion and patriotism, featuring 13 stripes and a subject of blue with stars that represented each and every state within the union.