On January 1, 1776, the Continental Army was reorganized in accordance with a Congressional resolution which placed American forces under George Washington's control. On that New Year's Day the Continental Army was laying siege to Boston which had been taken over by the British Army. Washington ordered the Grand Union flag hoisted above his base at Prospect Hill. It had 13 alternate red and white stripes and the British Union Jack in the upper left-hand corner (the canton).
In May of 1776, Betsy Ross reported that she sewed the first American flag.
On June 14, 1777, in order to establish an official flag for the new nation, the Continental Congress passed the first Flag Act: "Resolved, That the flag of the United States be made of thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new Constellation."
Between 1777 and 1960, Congress passed several acts that changed the shape, design and arrangement of the flag and allowed for additional stars and stripes to be added to reflect the admission of each new state
"The colors of the pales (the vertical stripes) are those used in the flag of the United States of America; White signifies purity and innocence, Red, hardiness & valour, and Blue, the color of the Chief (the broad band above the stripes) signifies vigilance, perseverance & justice."