The modern meaning of the flag was forged in December 1860, when Major Robert Anderson moved the U.S. garrison from Fort Moultrie to Fort Sumter in Charleston Harbor. Author Adam Goodheart argues this was the opening move of the American Civil War, and the flag was used throughout northern states to symbolize American nationalism and rejection of secessionism.
"Before that day, the flag had served mostly as a military ensign or a convenient marking of American territory, flown from forts, embassies, and ships, and displayed on special occasions like American Independence day. But in the weeks after Major Anderson's surprising stand, it became something different. Suddenly the Stars and Stripes flew—as it does today, and especially as it did after the September 11 attacks in 2001—from houses, from storefronts, from churches; above the village greens and college quads. For the first time American flags were mass-produced rather than individually stitched and even so, manufacturers could not keep up with demand. As the long winter of 1861 turned into spring, that old flag meant something new. The abstraction of the Union cause was transfigured into a physical thing: strips of cloth that millions of people would fight for, and many thousands die for."
– Adam Goodheart.
The flag of the United States is one of the nation's most widely recognized symbols. Within the United States, flags are frequently displayed not only on public buildings but on private residences. The flag is a common motif on decals for car windows, and clothing ornaments such as badges and lapel pins. Throughout the world the flag has been used in public discourse to refer to the United States.
The flag has become a powerful symbol of Americanism, and is proudly flown on many occasions, with giant outdoor flags used by retail outlets to draw customers. Desecration of the flag is considered a public outrage, but remains protected as freedom of speech. Scholars have noted the irony that "[t]he flag is so revered because it represents the land of the free, and that freedom includes the ability to use or abuse that flag in protest". In worldwide comparison, Testi noted in 2010 that the United States was not unique in adoring its banner, for the flags of Scandinavian countries are also "beloved, domesticated, commercialized and sacralized objects".
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