About flags and human "countries"

[MischievousWhisper]

So, I've been filling up an application for a custom item from one of my characters. She was born on earth and left at the age of sixteen, now she is back and recovered one of her mother's old jackets. Now here's the problem, this jacket has one (or two) flags sewed on one of the arms.

There is an actual image or idea about the European Union flag? Earth's supranational organizations have individual flags?

And the other question: Humans know about the countries that used to exist before the Sol Alliance and their heritage? Like, people on the station have "german accent" for example, they know what a german is? or where germany used to be?.

A lot of questions, but I just want to know so I don't screw up on my application later. Thanks for reading.

[LordFowl]

This is the Sol Alliance flag; https://aurorastation.org/wiki/images/e/ed/Sol_Alliance_Flag.png