You can't get more American than enjoying a good ol' Cheeseburger. This Sunday, September 18 is National Cheeseburger Day and to celebrate there are a few great fast food restaurants that are celebrating the day by giving away free cheeseburgers with any purchase.

Do you know who invented the Cheeseburger? It was a teenager named Lionel Sternberger. According to spruceeats.com and several other food history websites, back in 1924, he was 16 and working at his father's sandwich shop in Pasadena, California. He was cooking a burger and decided to slap a slice of American cheese on the patty and called it a Cheese Hamburger. Then in the 1930s  Kaelin's restaurant in Louisville, Kentucky called it the Cheeseburger and well, the rest is history.

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Here's where you can get a free cheeseburger with any purchase.

McDonald's -They took a survey and asked which burger they should giveaway the Double Cheeseburger won and you can get yours for free this Sunday with any $1 purchase through the McDonald's App.

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Burger King  Order through their App and you can get a regular cheeseburger for free with a purchase. This offer starts Saturday, September 17 and goes through Monday, September, 19.

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Wendy's - Order through their App and you can get a free Dave's Single with cheese through Wednesday, September 21.

There ya go! Now go get a Cheeseburger this weekend and enjoy National Cheeseburger Day!

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