Six more states also voted on marijuana measures, while voters in California and Washington state toughened gun control laws.
In all, five states considered whether to legalize the recreational use of marijuana. Arizonans defeated the measure in their state.
Overall, the results were hailed as historic by legalization activists, given that California is the most populous state. Massachusetts and Maine became the first states east of the Rockies to join the movement.
The referendum votes bring the total of states with full legalization of recreational marijuana to eight – Colorado, Washington state, Oregon and Alaska had already dropped their laws against pot.
Maine is the second border state to legalize recreational marijuana.
In Canada, where Prime Minister Justin Trudeau’s government was elected on a platform of legalizing recreational pot, a task force will present a detailed proposal in November.
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Voters in Arkansas, Florida and North Dakota approved measures allowing marijuana use for medical purposes. Montanans voted on whether to ease restrictions on an existing medical marijuana law.
Florida, where the pot measure was backed by 71 per cent of the voters, and Arkansas became the first states in the South with full-scale medical marijuana programs, which exist in 25 other states.
WATCH: A number of quirky ballot measures were voted for or against in a number of states that included legalizing medical marijuana, the repeal of the death penalty, and whether adult stars should have to wear condoms.
Collectively, it was the closest the U.S. has ever come to a national referendum on marijuana, which remains prohibited under federal law.
“These votes send a clear message to federal officials that it’s time to stop arresting and incarcerating marijuana users,” said Rob Kampia, executive director of the pro-legalization Marijuana Policy Project.
The outcome will more than triple the number of Americans living in states where recreational pot is legal. The jurisdictions where that’s already the case — Alaska, Colorado, Oregon, Washington state and the District of Columbia — have less than six per cent of the population.
In Nebraska, voters reinstated the death penalty, reversing the legislature’s decision last year to repeal capital punishment. Nebraska has not executed an inmate since 1997; 10 men currently sit on death row.
In all, there were more than 150 measures appearing on statewide ballots. California led the pack with 17 ballot questions, including one that would require actors in porn movies to wear condoms during filming of sexual intercourse. Another would ban single-use plastic grocery bags.
Another hot-button issue — gun control — was on the ballot in four states, including California, which already has some of the nation’s toughest gun-related laws. Voters there approved a measure that will outlaw possession of large-capacity ammunition magazines, require permits to buy ammunition and extend California’s unique program that allows authorities to seize firearms from owners who bought guns legally but are no longer allowed to own them.
Washington state approved a ballot measure that will allow judges to issue orders temporarily seizing guns from individuals who are deemed a threat.
In Maine and Nevada, a group founded by former New York City Mayor Michael Bloomberg spent millions promoting ballot measures that would require background checks on nearly all gun sales and transfers. Both contests were too close to call early Wednesday.
Supporters say the expanded background checks would close gaps in the federal system that allow felons, domestic abusers and the mentally ill to buy firearms from private sellers at gun shows and online without a background check.
Nebraska was one of three states voting on capital punishment. California had two competing measures on its ballot, one repealing its rarely used death penalty and the other speeding up appeals so convicted murderers are actually executed.
Oklahoma residents approved a measure to make it harder to abolish capital punishment. It seeks to ensure the state has a way to execute prisoners even if a given method is blocked.
Colorado voters approved a measure that will allow physicians to assist a terminally ill person in dying. That’s already a practice in five other states. Coloradans defeated a proposal that would have set up the nation’s first universal health-care system.