That's pushing it, Radriano. My parents live on an island about 20 miles from the mainland; are they therefore not North Americans?

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"Central America" is a political and not a geographical distinction. The only continents over here are North and South America. "Central America" is a part of the continent of North America. This can be easily seen on a map.

The dividing point between North America and South America is pretty easy -- I'd make it the point at which the Panama ithsmus touches the mainland of South America proper. It's far easier than determining where, east of the Black Sea but south of the Urals, Asia ends and Europe begins!

Alex