As long as your ICO was based outside the US and you did not sell any coins to US Citizens or US residents you have very little to worry about. About the only thing the SEC might do that would affect you is banning your cryptocurrency from trading on any US exchange by declaring your coins an unregistered security. It is inevitable that regulation of ICO's will happen. But it will be difficult for the US to exert the kind of softpower they once had and bend other countries to their will.
In real life it is quite different though. America has enough power all over the world to exert their will everywhere, except maybe a few countries like China or Russia. Europe and Japan, South Korea and Australia are all dependent on Uncle Sam and his whimsies. And it is not about governments as such but rather international corporations which have to abide by the laws and orders, official and unofficial, that Washington issues. See what happened to Swiss banks and their vaunted banking secrecy a few years ago to get an idea how things stand in the real world today.