"The Star Spangled Banner," national anthem of the United States, did not gain political approval as a national anthem until 1931, which seems a fair stretch from the War of 1812 and the battle at Ft. McHenry during which the Americans successfully defended Baltimore from a British assault in 1814. The British attacked with an hellacious barrage that went on and on and on and on. By morning, Francis Scott Key, author of "The Star-Spangled Banner," was able to frame the the anthem's question, "Oh say does that star-spangled banner yet wave ...?"
But it took until 1931 for Congress to put its stamp of approval on the song as the national anthem. Prior to that vote, such songs as "God Bless America" and "America" were heard at official gatherings without any congressional imprimatur.
One hundred and seventeen years.
This country, like every other, had flags to spare. Each symbolized this or that, called attention to this or that, inspired awe or devotion or, perhaps, horror at the cause for which it was raised. Flags are a serious business when it comes to symbolism, cohesiveness and propaganda.
But the national anthem had to wait. I guess music is more complex than cloth.
As a totally useless piece of information, I thought the scene was interesting.