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This reply is a bit late, but I will respond anyway.
Do you really mean "Column Selector"? Because column selectors are usually made up of a list of multiple column options.
Maybe what you need is a drop down list of Nationalities - which can be created in a prompt. And when you select the list in your prompt select statement, order it such that USA is first - by using a sort column, sort descending (depending on values in your dataset, etc).
Hope this helps.