The History of the American Flag
https://www.pbs.org/a-capitol-fourth/history/old-glory/

https://www.almanac.com/content/flag-day-celebration-american-flag

• Flag Day
  https://www.loc.gov/item/today-in-history/june-14
• How To Properly Fold A Flag
  https://www.legion.org/flag/folding

Interesting to note from LOC: "Both the United States district court and the court of appeals ruled in favor of the right to refuse to salute the flag. In 1940, however, the U.S. Supreme Court decided the government did have the authority to compel respect for the flag as a central symbol of national unity. Just three years later, on June 14, 1943, the Supreme Court reconsidered its earlier decision, holding that the right of free speech guaranteed by the First Amendment denies the government the authority to compel individuals to salute the American flag or to recite the pledge of allegiance."