High Quality Content by WIKIPEDIA articles! Coca has been cultivated in medium-altitude parts of the Bolivian Andes since at least the Inca era, primarily in the Yungas north and east of La Paz. Cultivation expanded substantially in the 1980s into the Chapare region of Cochabamba and some production flowed into the international cocaine market. The US-backed efforts to criminalize and eradicate coca (outside the Yungas) as part of the War on Drugs (as coca is used to make the powerful stimulant, anaesthetic and illegal recreational drug cocaine) were met by the cocalero movement`s growing capacity to organize. Violence between drug police and the Bolivian armed forces on one side and the movement on the other occurred episodically between 1987 and 2003. The cocaleros became an increasingly important political force during this period, co-founding the Movement for Socialism – Political Instrument for the Sovereignty of the Peoples party. Coca growers from both the Yungas and the Chapare have advocated for policies of "social control" over coca growing, maintaining a pre-set maximum area of cultivation as an alternative to drug war policies. In 2005, cocalero union leader Evo Morales was elected president of Bolivia. Morales has pursued a combined policy of legalizing coca production in the Chapare and Yungas and eradication of the crop elsewhere.