13 Feb 12
06 Jul 12 9:40 pm
Depends on your market. Some blogs are for local businesses, whose market is only one city or one region. Others only want to sell in the US - perhaps because of currency exchange issues or such. For example, If a keyword is popular in another part of the world, but not in the US, they need to know that.
The fact that people can reach your site from other parts of the world doesn't automatically make them your target market. If your target market is only the US, you wouldn't want to run an AdWords campaign over the whole world. By limiting it to the US, you not only save on advertising costs, but can show your ads only during the times when US visitors are likely to be awake and searching, saving even more. People doing this also need to see the US search volumes.
Mark Ling recommends concentrating on keywords with a thousand monthly searches or more. If a site is promoting only in the US, they also need the US figure for this reason.
Hope this helps....