I'm surprised no one made a direct answer to the OP's question

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I looked at the Sierra Tower and the Salk Song Tower. My question is will I notice a difference between these two speakers and lets say the JBL 890's which are less then half the price but not made in the USA.
If you can spend about $2000 for a pair of tower speakers, you have some excellent choices. Both the Sierra Tower and the Salk SongTower are excellent speakers, and I urge you to find a way to hear them (contact the manufacturers and ask who near you has them). They aren't identical, but they probably have more about them that is similar than different. In this price range, they are the speakers that everyone else tries to beat.
I could tell you my preferences, but you're buying them, not me. Depending on what type of finish you want in your room, I think Salk offers a wider variety of standard and optional veneers. Look below in my signature line for a link with photos of my SongTowers with a standard curly cherry veneer finish.
Even though I haven't heard the JBL 890s, I would guess that you could easily hear that it doesn't sound as good.
About being made in the USA, remember that all or nearly all woofers, tweeters, crossover and other parts are made outside of the USA. For example, Salk builds the cabinets and assembles everything in the USA, but buys parts from Norway, Denmark, Serbia, Taiwan, and China. I don't know those details for the Sierra Tower, but they could easily be similar.