I said "neo-Victorian." That qualifier is there for a reason; I recognize that the historical link I'm talking about here is indirect. The US was never "part" of any Victorian empire. In the aftermath of WWII, one of many changes to the world order was that the UK handed most of its remaining power over to us. We *are* the new Victorian empire, it is the other Anglophone nations and our cultural colonies which are "parts" in the way you mean it. (such as Japan, which cooperates with us enough in "security" matters to essentially be a Sixth Eye)
The reason I call this empire Victorian is that it derives its power and stability from using oppressive social engineering to enforce capitalist modes of operation and thought. The techniques of doing so were pioneered in the Victorian era, and consisted mainly of a bunch of child-rearing interventions (such as the Prussian model of compulsory schooling) first tested by Queen Victoria's vile German caretakers on the Queen herself. They molded her into a ruthless tyrant, and she quickly set about making sure every British child was raised in as cruel a fashion as she was. This is how capitalism was implemented in the British Empire. No more effective method has been found to get people who had worked the fields for generations to sit down, shut up, and tighten the same bolt for fourteen hours a day until such time as a rifle needed to be pressed into their hands.
The United States has carried on that tradition and taken it to dizzying new heights of global exploitation and inequality. The invention of the military-industrial complex and the forever wars that both sustain and justify its existence have made the overt sexual repression of actual Victorianism somewhat less necessary, which is why we get absurd bullshit like the CIA doing commercials for Pride Month. In all other ways, our liberties are strictly metered to make sure we don't get any funny ideas about deserving more of the value of our work, or our government representing our will when it comes to foreign wars that we're under contract with the Saudis to engage in. That is the neo-Vic empire, and it hasn't missed a spot. Through the Internet, everyone except uncontacted aboriginals feels the constant, immense pressure to conform to our definition of "freedom." The main reason there is any meaningful opposition to it is the existence of languages other than English. Every anglophone gets the capitalist brain worms and blind spots hammered into them from a very early age. You have to live a strange and unpleasant life to grow up enough to get rid of them.