Prepare cake mix as per directions on box. Fold in the sprinkles and then bake in a 9x13 pan.
Cool and cut into 1-inch cubes.
In a medium bowl, beat 1/3rd of the whipped topping into the blueberry preserves until combined, and carefully then fold in the remaining whipped topping. Chill until ready to use.
Combine the strawberries and the granulated sugar in a bowl and allow to macerate for at least 5 minutes.
Melt the white chocolate over a double boiler, then dip top of trifle dish in melted chocolate.
Sprinkle edge with red, white and blue sprinkles. Pour out remaining white chocolate onto a parchment-lined sheet pan and allow to cool for 15-20 minutes. Using a star-shaped cookie cutter, cut stars into chocolate. Sprinkle with red and blue popping candy and allow to cool completely before removing.
Assemble the trifle with a layer of cake, layer of strawberries, then layer of blueberry whip. Repeat until the trifle is filled. Top finished trifle with blueberries, white chocolate stars, more sprinkles, and sparklers.