The people of the US (at least the GOOD immigrants) are the children of the British empire. The greatest achievement in human history (Apollo Program) is due to no only German engineering, but also to US (and therefore British) spirit.
There is not space enough here to discuss all of the good that British colonialism did. Just to pick one, Look at the quality of education that the Queen left to her former subjects in the colonies. Why do you think that the Indians are so smart? They have top rate physicists and doctors and they developed nuclear weapons. Do you think they would be so technically advanced without British help?
They may have crappy food and bad teeth, but let's give them their due.