What about them? Doesn't look to me they are part of the US.

Read up on their history re: US occupation.

I guess you're trying to make a point. If my point was not clear enough: if the US was an empire, all these territories would continue to be under US occupation. Also Japan. West Germany too.

Now, here's the funny thing. Lots of people who hold the view that the US imperialistic, find various excuses for Russia's invasion of Ukraine. Some even go as far as claiming that the US aid to Ukraine is nothing but some further proof of the US imperialism.

I'd be very curious to hear where you are on that.