What does the blue rectangle or "Union" on the flag represent?

The blue rectangle, known as the "Union," on the flag represents unity. This aspect of the flag signifies the coming together of the states into a single nation and symbolizes the collective identity of the United States. Each star within the Union embodies a state, and together they highlight the importance of unity among different regions and communities within the country. This idea of unity is fundamental to the values of democracy, equality, and shared purpose in the nation’s identity. The stars, representing each state, reinforce the concept of being united under one government, promoting the idea of working together despite differences.