1 (18.25 ounce box) cake mix, baked in two layers
1 small box strawberry Jell-O
1 small box blueberry Jell-O
1 (12 ounce) container Cool Whip
Prepare cake mix according to directions on box, and bake in two layers.
Remove cakes from pans. Clean pans. Return cool cake to pans. Pierce cake with meat fork 1/2 inch apart.
Mix strawberry Jell-O and 1 cup boiling water; pour over first layer.
Repeat with blueberry Jell-O for second layer. Refrigerate 3-4 hours.
Dip pans in hot water to loosen cake. Put layers atop each other, using Cool Whip for filling and frosting.
Decorate top with small American flags.