sentences:  Among these attempts were California in 1972 (33% support), Oregon in 1986 (26%), Alaska in 2000 (41%), Nevada in 2002 (39%), Alaska in 2004 (44%), Colorado in 2006 (46%), Nevada in 2006 (46%), and California in 2010 (47%).In 2012, success was finally achieved for legalization advocates in the states of Washington and Colorado, when voters approved Initiative 502 and Amendment 64.In subsequent years, cannabis was legalized by ballot measure in Oregon (2014), Alaska (2014), the District of Columbia (2014), California (2016), Nevada (2016), Maine (2016), Massachusetts (2016), and Michigan (2018), and by an act of legislature in Vermont (2018), the Northern Mariana Islands (2018), Guam (2019), and Illinois (2019).