Okay. Korean and English sound nothing alike.
I think unless someone listens to Seth Efrekens and picks up on H -> HY and all vowels being pronounced like a short e (here -> Hyeh), you're looking at any English speaker from the Southern Hemisphere is 'Strayan to us. You all hop and have pouches for offspring security - no exceptions.
Most Americans could identify a posh Westminster/Kensington accent as English. Emma Watson, for example. But if you had Emma Watson, Saoirse Ronan, Ewan McGregor, someone from Hull or York, a Scouser, a Mancunian, and someone from Wales, and you asked Americans to identify their accents, they'd be fucked.
If you asked an American not from the Upper Midwest or maybe Maine/Washington/Alaska to discern between Wizcaaaaaaansen and Minnesooooooooota vs a Canadian from roooooond abooooot Edmonton, no fucking clue unless they watch South Park or Trailer Park Boys or Great White North.
Maybe a little bit more recognition of Boston vs New York vs New Jersey in other regions, but still less than half.
I don't think the vast majority of Americans outside the South could tell the difference between Louisiana and South Carolina unless they watched James Carville and The Waterboy quite a bit.
Also making fun of Aussie place names with Kiwis is a hell of a good time. I got them started with Ulladulla and Mooloolaba, and the Wallawallabollabollabingbongs came forth like Uruk Hai to Minas Tirith.
If you asked the average American to name a single province/state of Australia or Canada, your highest odds would be Quebec and Tasmania (note - by far the most common would be an incorrect New Zealand) and if 1 in 10 could give you one province/state each it'd be a miracle. If you asked the average American to name four countries of the United Kingdom, I am guessing one in three wouldn't even know you were talking about islands North of France and West of Norway. Of the rest, probably half would come up with England, and after that, you'd get more Irelands than Scotland and Wales combined. The sun might run out of heat before one in 40 came up with Northern Ireland unassisted.