Preheat oven to 325 degrees and place a baking pan filled with water on the bottom rack of your oven
Start by combining graham crackers, melted butter and sugar in a mixing bowl and then transferring the mixture to a 9 x 13 baking pan lined with parchment paper. Set aside
In a large mixing bowl, beat softened cream cheese until creamy and then add in sugar and salt and mix well. One by one, add in eggs and beat until each is incorporated before adding in the next one. Add in sour cream and vanilla and continue mixing until you have a creamy filling.
Transfer 1 1/3 cup of cheesecake filling evenly into two separate bowls and add red food coloring to one bowl and blue to the other.
Mix the food coloring in to combine. Pour the white cheesecake filling on top of graham cracker crust and smooth until even.
Using a spoon, pour alternating lines of blue cheesecake filling and red cheesecake filling down length of cheesecake. Swirl the colors into cheesecake filing using the back of knife (or a chopstick!) to create a beautiful swirl pattern. The more swirls, the better..
Bake in oven for 50-55 minutes or until center is no longer wobbly. When baking time is done, turn off oven, open oven door and let your Red White and Blue Cheesecake Bars sit for one hour in the open oven. Remove from oven and refrigerate overnight before pulling up on parchment paper and removing from baking pan. Cut into squares and serve!