The part that wasn't particularly surprising was that mixed drinks and cocktails, along with associated terms ("cocktail hour", "cocktail party") largely date to U.S. Prohibition, when bootleg (and low-quality) hard liquor had to be mixed with other ingredients to become drinkable: http://goo.gl/EBXM87
What was more surprising was that the vast majority of branded alcohols dated to no earlier than the 1950s. Baccardi Rum is a notable exception showing up in the 1920s (http://goo.gl/it9vOc)
Schmirnoff: 1950, on the nose: http://goo.gl/j0yle3 http://goo.gl/YxXJ9i
Remy Martin, Beefeater, Gordon's, and Bombay Gin: 1950s: http://goo.gl/qX6JEY
That "traditional old Number 7" Jack Daniels? 1970s: http://goo.gl/JWVLG6
And an "Irish pub" is really a 1990s phenomenon: http://goo.gl/vLwvTn
And if you look at many of today's "trendy" brands, most are creations of the 1980s, 1990s, or later: https://answers.yahoo.com/question/index?qid=20120306152857A...
"Mixology" itself -- also largely a creation of the past 20 years: http://goo.gl/1hVsEU
And whiskey, the American version at least, was largely created to allow movement of an otherwise unusable product -- frontier grain -- to the population centres of the East Coast.
Your "sophisticated drinks" are an ad-man's creation.