For those wanting to drink American, here's a handy reference regarding just the best known labels:
Owned by foreign corporations are Beam (including Maker's Mark) by Suntory/Japan, Four Roses by Kirin/Japan, George Dickel and Bulleit by Diageo/Britain, Wild Turkey by Campari/Italy, and Angels Envy by Bacardi/Bermuda.
American-owned largely by family businesses are Brown-Forman (Jack Daniel's, Woodford Reserve, Old Forester), Sazerac (Buffalo Trace, A. Smith Bowman, Barton 1792), Heaven Hill (Evan Williams, Elijah Craig, etc), and Luxco (Rebel Yell, Ezra Brooks).
Not a complete list. Usually Wiki can help you determine who owns and who distills (not always the same) a label. With the whiskey boom of the last decades, international investors have started buying into even small micro-distilleries.