Biography Reference Center gives you the ability to browse biographies by nationality from the Advanced Search Screen.
To browse biographies by nationality:
From the Advanced Search Screen, click the Nationalities link. The Indexes Browse Screen is displayed with Nationality selected in the drop-down menu.
Enter a term in the Browse for field or leave it empty to view a list of all nationalities.
Click Browse. A list of nationalities is displayed.
Build a search query by marking the terms and selecting a Boolean operator (and, or, not). Click Search. You are returned to the Keyword Search screen. A Result List is displayed.