which language is the easiest?
I am looking for a language that I can learn just for fun that is fairly easy, any suggestions?
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I would actually advise against Esperanto. Yes it is simple and logical, but outside of a very limited community it is pretty much used by nobody. There is no country to travel to, no movies to watch and just a few hardly original books to read.
Since you live in North America, it is kinda logical to try Spanish because it is a fairly simple language and enables you to travel south. If you are more interested in Europe then German would be the obvious choice, because it is in the same family as your native language and you are already learning French.
You could try Esperanto or some other constructed language which is designed to be easier than natural languages. Or why not Spanish, Portuguese or Italian since DuoLingo offers courses for them?
Although Duolingo doesn't support it (yet!) you might try Esperanto, as IG88 suggested. If you've reached level 10 in French (and presumably native English) then E-o should be relatively simple, and will give you a world-wide-reaching access across many cultures. While Esperanto gets a bad rap for being "artificial" (whatever that means) it developed an interesting 'culture', with it's own literature, music, a surprisingly robust Wikipedia, a tourism service like CouchSurfing, and even its own castle in France, "Gresilion"! Many courses are available at Lernu.net. Good luck!