I love the USA flag

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With all the negative things on the US right now, i have downloaded the USA flag picture. It looks nice and I have made it my wallpaper on my cellphone maybe next time i can use as wallpaper also on my tablet but anyway, I do like also the USA national anthem. Butt I just wonder which is really the national anthem of the USA. It seems to me there is two national anthems of the USA . when I am watching some one singing the national anthem of the US in the television, there seems to be two different songs for that