Start by self reflection on your hypocrisy. Do you feel bad about regularly using services from a country which has committed and supported some of the worst war crimes and genocide in history? (if not obvious, I am referring to the US)
It started before that, sure. It very much continued after (into the 20th Century), and was a major feature of the post-independence westward expansion of the US.
Of course, the imperial conquest of Philippines presaged more USA imperial conquest elsewhere.