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

https://simonadmb548.valiantfield.com/posts/civil-war-flag-variations-understanding-regional-differences-and-designs

The Union flag, which is called the Stars and Stripes, symbolized team spirit and patriotism, proposing thirteen stripes and a field of blue with stars that represented each one nation in the union.