Edison's patent is named "IMPROVEMENTS In Electric Lights", and was based on a Canadian patent -itself derived from Swan's- for a carbon filament lamp in nitrogen atmosphere, that Edison initially "borrowed" and then straight out bought. Edison lamp was just the cheapest and the one which won the commercialization battle. Contemporary to Edison, Piedmontese inventor Alessandro Cruto designed a lamp with ten times the life span and five time the efficiency of Edison's, meeting little commercial success outside of his region because he lacked distribution and large scale manufacturing capability. 20 years later, it's patents made their way to Holland, into a small family company in Eindhoven, becoming the basis for the global success of what is now known as Philips.

Just my thought! It's like saying eloff invented the electric car.. sort of... 🤨

And Nikola Tesla did a fair bit of "Edison's" work anyway

I reacted to that too, honestly. But I don’t think they bring that up to kids in school.

Canada, US and Mexico are in North America. There are 7 in Central America which is part of N. America and 12 in South America. Greenland is considered to be an island of N. America (did not know that, thanks Google) but is politically part of the European country of Denmark. So...11?

Depends one whether you divide America into North and South or North, Central and South, and on what you mean by those. In marketing terms, North American market is just USA and Canada. Not enough context was given. If it had said the word continent in the question you would have had the context to give the expected answer. I said 2 btw.

I would have included central America, too.

greenland isn´t a country