| 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 |
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