How many countries has the U.S. annexed in the last 80 years?

You’re completely wrong.

But even if you were right that the U.S. was simply applying its foreign policy to its “sphere of influence”, surely even you can see the immense foolishness of applying the same policies you have towards countries that are your enemies or even neutral to you, to countries that are your allies?

Finally, even if we accept that it’s actually really smart to treat your allies as your enemies, in all those other cases the U.S. responded because of attacks by those countries on America, American Allies or American companies. In the current situation there’s no such excuse.