How to promote my blog in USA's Audience?

[Kevin]

Really, it's best to try and host your website in the States. If that's not possible, then you can at least inform Google of your intended audience in Google Webmasters Tools and, more importantly, write US-centric content.

Really, you shouldn't target the 'US market' with your blog. Even if you did host in the States your would fail as it too wide an audience. You should target 'people interested in my content'. Google with rank you on relevancy and authority. If your content is written in US English, maybe has US prices, and has US city names in your content, that should get you ranking as a relevant site for a US audience.