How about some literary quotes referencing the American flag. Consider them a peek through the keyhole of American history. Good for parties too—when someone quotes from The Princess Bride, you can top them with John Stark.
From John Stark 1728-1822
My men, yonder are the Hessians. They were bought for seven pounds and ten pence a man. Are you worth more? Prove it. Tonight the American flags floats from yonder hill or Molly Stark sleeps a widow.
… before the Battle of Bennington, August 16, 1777
From Charles Sumner 1811-1874
There is the National flag. He must be cold indeed, who can look upon its fold rippling in the breeze without pride of country. If in a foreign land, the flag is companionship, and country itself, with all its endearments.
Are We a Nation [November 19, 1867]
William Tyler Page 1868-1942
I believe in the United States of America as a Government of the people, by the people, for the people; whose just powers are derived from the consent of the governed; A democracy in a republic, a sovereign Nation of many overeign States; a perfect Union, one and inseparable; established upon those principles of freedom, equality, justice, and humanity for which American patriots sacrificed their lives and fortunes. I therefore believe it is my duty to my country to love it; to support its Constitution; to obey its laws; to respect its Flag; and to defend it against all enemies.
The American’s Creed
Oliver Wendell Holmes 1809-1894
Ay, tear her tattered ensign down!
Long has it waved on high,
And many an eye has danced to see
That banner in the sky;
Beneath it rung the battle shout,
And burst the cannon’s roar—
The meteor of the ocean air
Shall sweep the clouds no more
from the poem Old Ironsides  st.1
(This poem created such national sentiment that is is generally credited with saving the frigate, U.S.S. Constitution, from being destroyed as unfit for further service.)
John Greenleaf Whittier 1807-1892
“Shoot if you must, this old gray head
But spare your country’s flag,” she said.
from the poem Barbara Frietchie
Henry Cuyler Brunner 1855-1896
Off with your hat as the flag goes by!
Airs from Arcady  The Old Flag st.1