Buy US made by Google.com: search protectionism?

At confoo conference, I attend to "Comment faire une bonne campagne Search + Social ?" session. I have been close to fall from my chair when I learn that google.com doesn't provide the same results in the United States compare to all other countries.

• Everywhere except US: google.com = search around the world
• US only: google.com = search in the US
  

Yes, if you search on google.com everywhere except in the US, you will search from the same index all around the world. If you are in the US, the search is limited to United States only. Isn't that protectionism?
In many fields, it is great that it is ranking closest business higher (ex: closest pizza place) but not filtering non US competitors when service doesn't need to be close by (ex: consulting services).
Knowing that the United states is the biggest promoter of the free market/open market etc., I am totally amaze to learn such a rule. Do as I Say, Not as I Do. As an example, if you don't have an address is the states and/or host our web site there, SEO (seach engine optimization) is useless to get new customers from the states (a insignificant market;), they won't find you if there are using the biggest search engine...google.
Do Oubama administration really need a buy America plan?
The first role of free trading in unrestricted access to information (i.e: économie de l'information: Joseph E. Stiglitz).
You can try it:

• What everyone outside the US see with google.com : http://www.google.com/ig?hl=all
• What US people see with google.com: http://www.google.com/ig?gl=us

As you will see, results aren't the same.