fistful:
It is one of the flags of the German Empire. My paternal grandmother's grandfather killed Frenchmen & Austrians under that flag. He did not leave me a flag, only a French ceremonial sword and a bayonet captured off some unlucky Frenchmen.
There was no love lost or pining for Germany by my ancestors. They bitterly resented being yanked off their farms in Schelswig-Holstein (repeatedly) to go off and kill lesser europeans*. I recall asking my grandfolks about Germany & what they though of it. They replied (with much barnyard language I shall omit), "If Germany was so great, why did they come here?"
The ADL goes apey when they see that flag, but they also think Nazis are hiding under everybody's beds.
* If you saw a photo of my ancestor mentioned above, almost EVERYONE is "lesser"--6'6" in the late 1800s)