Sharepoint help

Good morning,

I have a Sharepoint question. For our web site we would like to be able to have a combo box which the end user selects a “Province/State” from the drop down menu. Depending on which “Province/State” he selects, some web parts will be shown (content) and some parts will not be shown..
Is there any way to do this easily with Sharepoint?
My idea was to have some sort of global variables and have them turned true or false, depending on which ones are true/false, shows/hides certain web parts (content).

Thanks and please let me know if Sharepoint provides an easier solution other than creating a new site.