The Big Red Books in the center of the circle of Annie terminals on the Main level of the Library document the Library of Congress Subject Headings, and can be very useful in locating CORRECT searching terms.

If you look up 'Brazil' you will find more than 3 pages of details, including related search terms (RT), narrower search terms (NT), broader search terms (BT), and USE FOR indications of terms not used in the Library of Congress system.

A subject heading search (H on the Annie menu) for 'Latin America' produces:

      You searched for the SUBJECT: latin america 
      920 SUBJECTS found, with 2520 entries 
--but W (keyword) searches are more sensible places to begin, even if some of their results are irrelevant.