You can do it but we advise you to hire a U.S.-based company to help you. Competition is ten times higher in the U.S. for ranking on the Web.
First thing, you have to be sure that your key words match those used by an American person looking for your type of products or services. Registering a Web site is not enough. You have to fine-tune it for search engines and probably use satellite Web sites for your 5 to 10 best key words if you want to appear in the first 3 pages displayed by the search engines.
You will find very serious American companies that will do the job and will give you back money if your Web site does not appear within the first 3 pages of major search engines.