Grand Union Flag
The Continental Grand Union Flag (often referred to as the first American flag, Cambridge Flag, and Grand Union Flag) was the flag of the United Colonies from 1775 to 1776, and the de facto flag of the United States until 1777, when the 13 star flag was adopted by the Continental Congress. It was a variant of the British 'Red Ensign.'
The Continental Union Flag was so called because it combined the British Union flag (denoting the kingdoms of England and Scotland) with thirteen stripes (representing the United Colonies).