What is the primary grain used to make American whiskey?

The primary grain used to make American whiskey is corn. This is particularly true for bourbon, which is a type of American whiskey. By law, bourbon must contain at least 51% corn in its grain mixture, which contributes significantly to its sweet flavor and full-bodied character. The use of corn not only affects the taste profile but also has historical significance, as corn was abundantly available in the United States and became the dominant grain in whiskey production.

Each of the other grains listed, while used in various whiskey production methods, does not serve as the primary ingredient in American whiskey. Barley is mainly associated with Scotch whisky, rye is used in rye whiskey, and wheat can be found in some bourbon recipes but does not comprise the majority of any specific American whiskey production.