Why has the us flag changed so many times?

The U.S. flag has changed multiple times primarily due to the admission of new states into the Union. Each time a new state joined, a star was added to represent it, leading to changes in the flag's design. Additionally, the arrangement of stars has been modified to ensure a visually appealing and balanced appearance. The current flag, with 50 stars, has been in use since July 4, 1960, after Hawaii became the last state to join.