I had two clients from America I want offer graphics designing jobs for, I demanded my payment would be in Bitcoin
BTC or Ethereum. To my greatest dismay, they were dumfounded on what Bitcoin or Ethereum is. I am still suprised up to this very moment.

I think it's pretty common among folks who don't have a touch with Technology. Moreover thing is the number of people knowing BTC in states would be much higher than that of other countries which are developing so you can easily realize how less number of people know about cryptos. But this is for any other Technological Concept. Some girls I know don't even know what a RAM is and why should they look for higher RAM while buying a Mobile Phone or any other gadget. Cryptos similarly is a technological invention and not financial.
I had two clients from America I want offer graphics designing jobs for, I demanded my payment would be in Bitcoin
BTC or Ethereum. To my greatest dismay, they were dumfounded on what Bitcoin or Ethereum is. I am still suprised up to this very moment.

Your clients does not represent the whole America so how come that you conclude about this by just your clients does not know about Bitcoin or ethereum?
But i think there are many americans already Knew about Bitcoin but of course like the whole world there are smaller amount compared to those who have ideas.
But lets see couple years from now,Maybe your client will already have idea what this is and how convenient using crypto as payment.
The sample space might be low as per the OP but if you look at various surveys conducted by many different websites you would realize that most of the people don't know about it. I would be quite astonished if even 50% of the folks in the state know about Bitcoin.