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Apple has seemingly found a way to block Android’s new iMessage app
(www.theverge.com)
This is a most excellent place for technology news and articles.
American is pretty unambiguous. What are you getting it mixed up with? No one else uses it. If you hear American, do you have to run through a list of other countries asking them which they are from? Of not, it's unambiguous.
You could argue that it shouldn't be the pronoun for a US citizen, but that's a different argument than it being ambiguous.
Whatever adjective makes you feel better: appropriate, apt, fitting, correct, modest, less expansive, less assuming, less imperious, less opulent, less grandiose, less egocentric, less narcissistic