Hardly, you are giving too much weight to American holders. It is known that in this world the most holders live in China. If all Americans sold their Bitcoin, it would temporarily go down as you say, but never nowhere near $50. I doubt an American dump is able to manipulate the price beyond a few thousand.

If Trump does the same to Bitcoin, the net would route around it, exactly as designed. We are here in this very forum telling people in India how things would work in that case, USA is no different, same thing would apply: Use Tor, and be proud its an US Navy project, God Bless America.

The United States

Momentarily, the United States are home to most of crypto endeavors and activities, with a large number of exchanges, trading platforms, funds, crypto mining facilities, and blockchain-oriented projects. Because of this, most would consider it normal for this country to have the largest number of Bitcoin hodlers out of all the countries.
considering that it has the largest population in comparison with the rest, its 8% of Bitcoin owners still represents a large number.