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Disputes - international:
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prolonged drought, population growth, and outmoded practices and infrastructure in the border region have strained water-sharing arrangements with the US; nationals from Central America slip into Mexico seeking work or transit into the US; undocumented Mexican nationals continue to enter the United States
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Illicit drugs:
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illicit cultivation of opium poppy (cultivation in 2001 - 4,400 hectares; potential heroin production - 7 metric tons) and of cannabis (in 2001 - 4,100 hectares); government eradication efforts have been key in keeping illicit crop levels low; 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 70 percent 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
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