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

https://ericksigh824.birchreport.com/posts/flags-as-historical-artifacts-insights-into-the-civil-war-era

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