Who did you think presided over colonialism, genius? Martians?
By the time of the Great Irish Famine (one of the British Empire’s earliest achievements) the transformation of England from a feudal society to a liberal one was complete.
The US was literally founded as the model for the liberal nation state - it’s entire history of genocide, slavery and yes, colonialism was drenched in the tenets of liberalism from the moment the constitution was signed right to this very day.
Go redo your history - and, this time, don’t get it from PragerU.