"US Americans" ?!
Sure, as opposed to Central Americans, South Americans, Mexicans, or Canadians. There is no estadounidenses in English but "Americans" logically includes Alaskans through Argentinians.
http://www.youtube.com/watch?v=lj3iNxZ8Dww
I suppose it's technically correct, but it doesn't sound good at all. Especially since they already just used 'Americans' in the title. "People of the United States" or something like that also reads better.
Sure, citizens of other countries in the Americas could also be called Americans, but in reality, if you're trying to actually communicate clearly with other people, rather than score political correctness points, you would not use that term for, say, a Canadian or a Brazilian, because there are already perfectly good, more specific terms for citizens of said countries.
Likewise, if you were really trying to talk about the commonalities of everyone from Alaskans to Argentinians you'd presumably use something like "peoples of the Americas".