Disputes - international:
prolonged drought, population growth, and outmoded practices and infrastructure in the border region have strained water-sharing arrangements with the US; the US has stepped up efforts to stem nationals from Mexico, Central America, and other parts of the world from illegally crossing the border with Mexico
Refugees and internally displaced persons:
IDPs: 12,000 (government's quashing of Zapatista uprising in 1994 in eastern Chiapas Region) (2005)
Illicit drugs:
major drug-producing nation; cultivation of opium poppy in 2004 amounted to 3,500 hectares, but opium cultivation stayed within the range - between 3,500 and 5,500 hectares - observed in nine of the last 12 years; potential production of 9 metric tons of pure heroin, or 23 metric tons of "black tar" heroin, the dominant form of Mexican heroin in the western United States; marijuana cultivation decreased 23% to 5,800 hectares in 2004 after decade-high cultivation peak in 2003; potential production of 10,400 metric tons of marijuana in 2004; government conducts the largest independent illicit-crop eradication program in the world; major supplier of heroin and largest foreign supplier of marijuana and methamphetamine to the US market; continues as the primary transshipment country for US-bound cocaine from South America, accounting for about 90% of estimated annual cocaine movement to the US; major drug syndicates control majority of drug trafficking throughout the country; producer and distributor of ecstasy; significant money-laundering center
