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

https://dominicktnpm129.talesignal.com/posts/reenacting-history-the-importance-of-accurate-civil-war-flags

The Union flag, referred to as the Stars and Stripes, symbolized unity and patriotism, featuring thirteen stripes and a subject of blue with stars that represented each and every kingdom within the union.