What would happen if we protested in the US?

What if a group of Canadians gathered in DC and raised a stink about any future plans of annexation ?

I can imagine Americans would join.

But legally, what could happen to us? I’m assuming their 1st Amendment rights don’t extend to us…

If we were to be arrested would we be labelled terorrists?

Do any Canadians have any experience joining BLM Marches in the US?

Elbows Up needs to go on the road.