US, Ireland and many others were founded by terrorists. History is written by the victors.
The Americans were the colonialists. They fought to evade taxes and to be free to steal land from its indigenous inhabitants, in pursuit of which they committed a genocide. The latter, in particular, was strongly opposed by the British government. A 1763 Royal Proclamation prohibited settlement west of the Appalachian Mountains, reserving lands for indigenous peoples. After alleviating themselves of those restrictions, the freedom-loving Americans then practiced a brutal form of chattel slavery for many decades after it had been outlawed by more civilized nations, including the Empire they had fought to be free of.