males age 16-49: 22,188,284 females age 16-49: 24,884,614 (2008 est.)
Manpower reaching militarily significant age annually:
male: 1,110,544 female: 1,073,223 (2008 est.)
Military expenditures:
0.5% of GDP (2006 est.)
Transnational Issues
Mexico
Disputes - international:
abundant rainfall in recent years along much of the Mexico-US border region has ameliorated periodically strained water-sharing arrangements; the US has intensified security measures to monitor and control legal and illegal personnel, transport, and commodities across its border with Mexico; Mexico must deal with thousands of impoverished Guatemalans and other Central Americans who cross the porous border looking for work in Mexico and the United States
Refugees and internally displaced persons:
IDPs: 5,500-10,000 (government's quashing of Zapatista uprising in 1994 in eastern Chiapas Region) (2007)