The Flag Resolution was passed on June 14th, 1777 by the Marine Committee in Congress. Due to this occurrence, every 14th of June is known as Flag Day.
The Resolution said:
Resolved, That the flag of the United States be thirteen stripes, alternative red and white; that the union be thirteen stars, white in a blue field, representing a new Constellation.
Instead of the star pattern of the modern US national flag, the first one had a circle of stars in the canton. This version of the flag is commonly referred to as the Betsy Ross Flag, thus named after the girl who is believed to have sewn the first flag, based on a design given to her by George Washington.