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

https://stephenqsil969.sagecurrent.com/posts/civil-war-flag-etiquette-understanding-proper-display-and-respect

The Union flag, generally known as the Stars and Stripes, symbolized cohesion and patriotism, providing 13 stripes and a discipline of blue with stars that represented every country within the union.