The Union flag, often known as the Stars and Stripes, symbolized cohesion and patriotism

https://stephentkru765.cloudhinter.com/posts/the-role-of-civil-war-flags-in-battles-and-ceremonies

The Union flag, known as the Stars and Stripes, symbolized team spirit and patriotism, featuring thirteen stripes and a field of blue with stars that represented both state within the union.