Who told you he was Hungarian?
He did.
Can you trust that, any more than anything else he said?
Actually someone just mentioned that he was Turkish.
There are also other sources about the Kaiser, not only him
I challenge you to find even the most savant polyglot speaking a foreign language without a trace of an accent.
Extra points for two languages with such different phonetics as Hungarian and English
There is a known phenomena among some E Asian living in America to learn English so thoroughly that they loose the accent. The problem is that their English is too good; their diction becomes the accent that gives them away.
It’s almost impossible to pass as a native speaker without years of immersion in the culture.
East Asian or Eastern European? Asian to English is a hard change. I’ve met many Eastern Europeans that you’d never tell.
I know a Swedish person who people absolutely refuse to believe is Swedish. She learned English largely from TV and speaks perfect vernacular English with a SoCal accent. She’s also black so I think that contributes to it.
I don’t think it’s impossible to do, just impossible to do alone. If you’ve got enough time and a good dialect coach, you can totally get there (H>E at least, I’d suspect E>H is harder for many reasons)
