One of the staples of Americans' diets over the years has been the cheeseburger.

The hamburger was created around 1900. It is believed that cheese was not added and officially recognized until decades later. Many Americans prefer their burger with the typical items: a bun, a ground-beef meat patty, lettuce, tomatoes, pickles, mayonnaise and ketchup.

National Cheeseburger Day this year is on Sunday, Sept. 18, and there are many chains that will offer deals to ensure people can celebrate properly. Here's where you can grab some of the best free or cheap cheeseburgers.

7-Eleven: CNET reports that 7Rewards and Speedy Rewards members will be able to get a 1/4 cheeseburger for $2.00 on Sept. 18. The offer will also be available on the 7NOW app.

Applebee's: According to a press release, the restaurant chain will offer a $10.99 bundle deal featuring any of their burgers, as well as fries and a fountain drink.

Dickey's Barbeque Pit: Four days of deals will be available through the restaurant's virtual company, Big Deal Burger. From Sept. 15-16, a Big Deal Burger Double with cheese for $6, while a Big Deal Burger single with cheese will be available for $5 from Sept. 17-18. A combo will also be available for $10.00

Burger King: According to Thrillist, Burger King is offering a multi-day deal from Sept. 17-19 which offers a free cheeseburger with a $1 purchase from its website or app.

Wendy's: Until Sept. 21, those who make any purchase on the app can get a free Dave's Single with cheese.