Jack Daniel's whiskey would be bourbon if it wasn't charcoal filtered. Bourbon can't contain any added flavoring, coloring, or other additives. Charcoal filtering changes the flavor or they wouldn't do it. I think it changes the color too. The only thing that can legally be added to bourbon is water, to get the proof they want to put in the bottles.
But after a lot of looking on the internet, it looks like after NAFTA passed there's a requirement that Tennessee whiskey be "a straight Bourbon Whiskey authorized to be produced only in the State of Tennessee." That's from Wikipedia. So it sounds like Tennessee whiskey is bourbon, but bourbon isn't Tennessee whiskey, unless it's bourbon made in Tennessee. Calling it Tennessee whiskey must just be a marketing tool and nothing more.
Then in 2013, Tennessee governor Bill Haslam signed a bill requiring the Lincoln County process (which involves maple charcoal filtering) to be used for products produced in the state labeling themselves as "Tennessee Whiskey" A specific exception was made for Benjamin Prichard's, which doesn't use the Lincoln County process. So in Tennessee all whiskeys have to be made the same way to be called Tennessee whiskey, except that one brand.
I'm still waiting to hear how or why the best selling bourbon in the whole world isn't bourbon.
P.S. I only had a Manhattan once and really enjoyed it. It still had a bourbon flavor to it, but not strong like straight whiskey.