"I do not think you should call Americans Yanks..unless you know they are from the northern states."

I am prepared to respect your opinion, and if you want to behave that way, your actions.

But we Aussies in WWII called all men in US uniform, white (OR black even though the Yanks segregated and treated them badly even here) Yanks as an affectionate term with no care to what part (or what race) of their own segregated bigoted racist country they came from :-) - and indeed many Aussie girls married them. My own mother's sister went back with her choice as a War Bride. We had the slogan "Over Paid, Over Sexed and Over Here!" Interestingly the term "Nigger" was not much in use before we were subjected to the delightful Yank Imperialistic Culture ... :-P we had our own local words for our own local 'ethnics' ... :-)

It is an old tradition here (but not used as commonly now, except when talking about The Ashes - Beating the well loved Poms at Cricket) to call anyone from Great Britain a Whinging Pom - cause you often heard them complain after they had taken the highly subsidized Ten Pound Boat Trip here that things were always better back home, weather, etc. Most of those who did return, couldn't get back here fast enough ... :-)

As far as the term 'Wog' - well it used to be considered somewhat derisory, but some of those of that ethnic descent have now taken over the term themselves and made some very entertaining and funny TV shows and Movies about 'The Wog Boys'.

We have a Muslim comedian, who is side splittingly funny, and has turned inside out many of the jibes that could be leveled at that group.

We even have a cerebral palsy sufferer who is a great comedian here, guess what his funniest material is - we now regard 'Spastic' as no-PC, but that doesn't stop him using it... Steady Eddie.

The old saying "Sticks and stones" seems to work well here. :-)