:It doesn't matter what I believe, or TVH believes. It matters what can be verified. The reliable sources give significantly more weight that Americans are citizens of the United States. Who are American, but those who have American nationality. Sure there are aliens who claim American identity, but that usage has less weight than that of the more common usage, regardless of what advocates for "immigration reform" want. The lead section gives both views weight, but does not give undue weight to the less common view that Americans are just anyone who happens to reside in the United States. The USCB does not determine who Americans are, that is not within their mandate, and to construed that it does is WP:SYNTH at best. 
 : 
 :"...see your way..."? Sorry, nope. Not supported by reliable sources, either dictionary definition or otherwise. Otherwise, this article might as well be about all people who reside in the Americas (as some have advocated). That is not what this article is about. There are two articles about those who don't have American nationality who reside in the United States: Illegal immigrant population of the United States, Permanent residence (United States). Perhaps the latter article can use expansion by including demographics of those lawful aliens; I would very much support that. 
 :Rather than change the scope of this article, work on improving those articles.