Voters from Vermont to Colorado, Alaska to American Samoa, and a host of states in between headed to polling places and caucus sites on the busiest day of the 2016 primaries.
Donald Trump and Hillary Clinton, who have won three of the four early voting contests, could have an opportunity to pull away from their rivals in a delegate-rich dash across the country.
Republicans are voting in 11 states, with 595 delegates at stake. Democrats are casting ballots in 11 states, too, plus the territory of American Samoa, with 865 delegates up for grabs.
A collection of photos capturing the day known as Super Tuesday, from across the United States and beyond, by The Associated Press.