I m confuse with your queries. Actually i always wanna know,if there is such kinda why of seo technique with the use of which we can get US traffic.
For getting US traffic you have to work in some US specific sites. Start promotion in US forums, start commenting in some good US specific news sites.
use the US server for your website and US spesific transfer BW,,it may help you to get more visitor for US&Canada...
For getting traffic from US first you have to get us server, then do search engine optimization for the website, try to get links for relevant sites from us. social media optimization is also beneficial for getting huge traffic.
You must work on US hosted websites, If you are promoting website in google seach engine, try to work in US location then you can get only those site which is hosted on US server. Analyze US based website backlniks for link building.
First you should go for a US based server to host your site after hosting promote it to us based and relevant web sites or web directories. there are so many process and steps to getting more traffic to us but most reason is as i have suggested before.
To get a traffic from US you have to work for us google data center. You have to start the work like directory, article and social bookmarking only US directory.
change your target setting in google webmaster tools. So your website never showing on google search in another country.
To promote your site or increase your page rank has many strategies but first page optimization is necessary before going to make back links and advertise. the Site pages should be optimize and simple to attract customers.
Get back links at the sites of US mean get links on such sites that have US traffic via Blogs, fourms, text links etc
What is the website you are wanting to promote? Without knowing what the site is about then you're only going to get very generic advice here.