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Natalie, My first suggestion is ensure there are no genericTLD's available for your product/service. (.org, .info, .co, etc.). If they are not available, one that is treated by many as a generic even though it is a ccTLD is .io. Even Google looks at it as a generic. You would then set your geographic target as US in GWMT. Go to your site in GWMT and in the top right corner there is a gear symbol you click on. It will give you three choices and site settings is the one you want. In site settings the first item is Geographic Target. Set if for the US and then rock and roll. Hope this helps, Robert