If you are targeting visitors from USA, then there is nothing to be different in terms of promotion. It would only change if you to target an specific country except USA.
try to look at the specific market, like looking at the domain while using google.
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You should perform SEO activities to keep in mind USA such as directory submission in USA directory search engine submission in USA, and mention distribution in USA in Onpage optimization.
If you are targeting visitors from USA, then there is nothing to be different in terms of promotion. It would only change if you to target an specific country except USA.
i agreed with you, using country name in your targeted keywords is a great option.