Flag Day: Photos show how US flag has evolved since 1777

On this day in 1777 Congress officially adopted the Stars and Stripes as the US flag.

Here’s what Congress said at the time: “Resolved, that the flag of the United States be thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new constellation.”

The flag was based on the Grand Union flag carried by the Continental Army in its fight against the British during the War of Independence, with its 13 stars and stripes representing the 13 original US Colonies.

Until then, colonies and militias had carried a number of different flags.

Who came up with the design of the flag is something of a mystery, with some historians believing it was designed by Francis Hopkinson, a New Jersey Congressman, and sewn by Philadelphia seamstress Betsy Ross.

H. Armstrong Roberts/Retrofile/Getty Images

Many know the flag as “Old Glory.” This was the name given to a large 10-by-17-foot US flag by its owner, sea captain William Driver.

In the Civil War the flag survived many attempts by Confederate forces to seize and destroy it. Driver’s name for that flag later became a nickname for all US flags.

The ‘Star Spangled Banner’ that inspired the national anthem flew over Fort McHenry in the 1812 war with the British.

Seeing the the giant 15-star, 15-stripe banner still standing after a fierce bombardment, Francis Scott Key penned his famous words and set them to music.

Gett Images

The flag went through changes over the years, with Congress passing declarations to add stars and stripes and change the design of the flag as new states joined the union.

In 1818 Congress passed a new resolution, stating that the flag should revert to 13 stripes, with only stars added for new states.

Kean Collection/Getty Images

One hundred years after the official adoption of the Stars and Stripes, Congress marked National Flag Day, with the banner flown over public buildings across the nation.

It was President Harry Truman who in 1949 officially designated June 14 Flag Day —a day of national observance.

AP Photo/Henry Griffin

Today, the flag has 13 stripes, representing the original colonies, and 50 stars representing each state.

This version is the longest-serving US flag, having been officially adopted in 1960 to acknowledge Hawaii, the newest state.

The current flag was designed by Ohio high school student Robert G. Heft. His design beat thousands of others to be adopted as the official US flag.

MANDEL NGAN/AFP/Getty Images