Residents of Oregon, Alaska, and the U.S. capital voted to legalize marijuana on Tuesday, in key victories that could fuel the legalization movement as cannabis usage is increasingly recognized by the American public.

The Oregon and Alaska measures would legalize recreational pot use and usher in a network of retail pot shops similar to those operating in Washington state and Colorado, which in 2012 voted to become the first U.S. states to allow marijuana use for fun.

A less far-reaching proposal in the District of Columbia to allow marijuana possession but not retail sales won nearly 65 percent of the vote with all precincts reporting, unofficial results showed.

The D.C. measure had been strongly favored to pass but could still be halted during a review by the U.S. Congress, which has constitutional oversight over the capital. The measure would allow adults 21 and older to possess up to two ounces (57 grams) of cannabis and grow up to six plants.

The Oregon law, which drew 54 percent support in preliminary returns, takes effect in July 2015 and stores could open the following year.

The Alaska measure led by about 52-48 percent with all precincts reporting preliminary results early on Wednesday, and groups for and against the initiative said it had passed. If given official approval, a regulatory body would have nine months to write regulations after the election is certified and the measure becomes law, with stores likely coming at some point in 2016.