I wouldn't be so sure. If the entire US decided to gang up on one city, especially a city with a strong identity (New York or Boston) then you might see this.
Look at how New York responded after 9/11. Now put yourself in the shoes of the people of Hong Kong. When a group of people come to believe they are facing an existential threat, they respond in extraordinary ways.
The last massive protests that looked like this took place in multiple cities over several weeks. That was leading up to the Iraq war. They were ignored.
Were the Iraq war protesters facing existential threats? No. So the situations are not comparable.
Imagine if the US passed a law allowing Southern States to extradite, prosecute, and imprison anyone in New York for criticizing the Republican party. You'd have ten million New Yorkers out in full force.
Look at how New York responded after 9/11. Now put yourself in the shoes of the people of Hong Kong. When a group of people come to believe they are facing an existential threat, they respond in extraordinary ways.