Note that the flag beside President Biden does not have gold trim at the summit with Putin. See below for Biden standing in front of flag WITH gold-trim and the meaning.
Whereas, when the president speaks to U.S. citizens, who are the people of Guam, PR and other territories, he speaks beside a gold-trimmed flag because the territories are controlled by the military government. It’s just that everyone assumes Biden and the federal government are speaking to the citizens of the states.
I can assure thee that the choice of flags is not for design purposes. There are political consequences. The truth is right in front of us.