The Grand Union Flag, known as the first national flag of the United States

https://blogfreely.net/muirencqyz/flags-of-freedom-the-story-behind-the-banners-of-the-revolutionary-war

The Grand Union Flag, known as the first national flag of the United States, combined the British Union Jack with 13 stripes, representing the colonies' unity in their quest for independence from British rule in 1775.