Since tomorrow is july 4th, we talk about some interesting facts about independence day and the national anthem. For example, did you know that the signing of the declaration of independence didn't actually happen on the 4th of july? Twelve of the thirteen colonies actually approved it on july second, not the 4th. 

Source: https://wallpapercave.com/free-4th-of-july-backgrounds#

Sources:

http://www.rfdtv.com/story/32328872/4th-of-july-fun-
facts

http://www.masshist.org/digitaladams/archive/doc?id=L17760703jasecond

https://www.usatoday.com/story/news/2018/07/03/july-4th-things-you-didnt-know/754244002/

https://www.history.com/topics/the-star-spangled-banner