The United States Of America, Part Five. This is the story of how the American Republic developed from colonial beginnings in the 16th century, when the first European explorers arrived, until modern times.
Medical marijuana is now legal in 20 states and the District of Columbia. Of those states, Washington and Colorado have legalized marijuana for recreational use. Colorado's first retail marijuana stores opened Jan. 1 for sale to people 21 years and older. Under federal law, marijuana is still an illegal drug.
Currently, it's legal to use recreational marijuana only in four states and in the District of Columbia. Colorado and Washington state voted to OK it in 2012. Alaska and Oregon voters approved it in 2014. Medical marijuana is legal in half of US states and is on state ballots this year in Montana, Florida and North Dakota.