During the early 1860s plenty of hostile units were on US soil. Over million people died.

It is interesting that at this polarising times, the idea that this weaponry will be used in an internal conflict is not considered.

I'd counted that conflict as internal in GP. It seems the nations of the time agreed: none recognised the Confederacy.

https://en.wikipedia.org/wiki/Diplomacy_of_the_American_Civi...

(I've noticed many revolutionary movements fail when their key exports turn out to have been worth less, due to stocking or substitution, on world markets than they'd been planning. Sometime I should check successful revolutions, and see what happened in their export markets...)

Edit: for the US revolution, nothing so far on the economic effects of the British blockade, but the https://en.wikipedia.org/wiki/Battle_of_the_Chesapeake implies they lacked complete naval superiority.

The comment I was replying to is the other way around. The times the USA has attacked other countries are too numerous to type out.