The Union flag, called the Stars and Stripes, symbolized harmony and patriotism

https://zionitwe861.clearminster.com/posts/flags-of-honor-the-symbolism-behind-civil-war-colors-and-emblems-6

The Union flag, often known as the Stars and Stripes, symbolized harmony and patriotism, presenting thirteen stripes and a subject of blue with stars that represented each kingdom inside the union.