| Date - Field | Mexico - Geography - note |
2009 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2008 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2007 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2006 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2005 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2004 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2003 January Geography - note | strategic location on southern border of US; corn (maize), one of the world's major grain crops, is thought to have originated in Mexico |
2002 January Geography - note | strategic location on southern border of US |
2001 January Geography - note | strategic location on southern border of US |
2000 January Geography - note | strategic location on southern border of US |