2 stores in one account in different countries

I want to know how I would go about haveing, one store for CAD for Canada and one store for USD in the United States on one domain, but have an /US/ for American customers. The same say my store has multiple languages. I want to get the second store but want to know more how to set it up. Also would google think the content was dublicatd if I did this? not sure what is best.