In Speakeasy, Jason Kosmas and Dushan Zaric of Employees Only say that Campari Spritz is the predecessor of the popular Aperol Spritz: "Whereas the Aperol version is soft, the Campari version is bold and assertive."
SPRITZ Found all over Italy, the spritz is a classically Venetian cocktail that pairs well with all sorts of cicheti. 3 oz. prosecco 1½ oz. bitter aperitif liqueur, such as Aperol or Campari 1½ oz. soda water Orange slice, to garnish Combine prosecco, liqueur and soda water in a tall glass filled with ice; garnish with orange slice.
Bright red and bittersweet, the Americano was born as the "Milano-Torino" at Caffè Camparino in the 1860's (the Campari came from Milan, the sweet vermouth from Turin). The cocktail eventually became known as the Americano due to its popularity with American expats during prohibition.
The Boulevardier Combine 2 ounces bourbon, 1 ounce Campari, and 1 ounce sweet vermouth (preferably Antica Formula) in a large mixing glass filled with ice. Read More http://www.bonappetit.com/recipes/2013/03/boulevardier#ixzz2NL6IV0M9