1775 - The United States Navy originated as the Continental Navy, established early in the American Revolution by the Continental Congress by a resolution of 13 October 1775. The Continental Navy flew a jack consisting of alternating red and white stripes, having the image of a rattlesnake stretched out across it, with the motto "Don't Tread on Me."
1777 - Flag Resolution of June 14, 1777 states: "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."
1794 - Provided 15 stripes and 15 stars after May 1795. Act of January 13, 1794.
1818 - Provided 13 stripes and one star for each state, to be added to the flag on the 4th of July following the admission of each new state. Act of April 4, 1818.
1912 - Executive Order of President Taft dated June 24, 1912. Established proportions of the flag and provided for arrangement of the stars in six horizonatal rows of eight each, a single point of each star to be upward.
1959 - Executive Order of President Eisenhower dated January 3, 1959. Provided for the arrangement of the stars in seven rows of seven stars each, staggered horizontally and vertically.
1959 - Executive Order of President Eisenhower dated August 21, 1959. Provided for the arrangement of nine rows of stars staggered horizontally and eleven rows of stars staggered vertically.