The American whiskey category can be broken down into several subcategories. They are differentiated by the proof at which they are distilled, the types of grain in the mash and the length of time they are aged. Popular American Whiskies include Bourbon Whiskey, Tennessee Whiskey and Blended American Whiskey. Most North American whiskies are made in column stills and aged in oak barrels, which can be charred or not charred.

For a whiskey to be considered an American whiskey, it must meet the following criteria as set forth by the United States government:

-Be made from a grain mash
-Be distilled at 90 percent ABV or less
-Be reduced to no more than 62.5 percent ABV (125 proof) before being aged in oak barrels (except for corn whiskey, which does not have to be aged in wood)
-Have the aroma, taste and characteristics attributed to whiskey
-Be bottled at no less than 40 percent ABV (80 proof)

Whiskey image via Shutterstock