Hillary Clinton is the presumptive Democratic presidential nominee after officially securing the required number of delegates Tuesday.
"Tonight's victory is not about one person," said Clinton, the first woman to win a U.S. presidential nomination. "It belongs to generations of women and men who struggled and sacrificed and made this moment possible."
Six states voted Tuesday, and Clinton won in four of them -- California, New Jersey, New Mexico and South Dakota. Her Democratic rival, Bernie Sanders, picked up North Dakota and Montana.
Sanders thanked his supporters Tuesday "for being part of a political revolution" and promised to stay in the race through the Democratic National Convention in Philadelphia next month.
"Next Tuesday we continue the fight," he said. "We are going to fight hard to win the primary in Washington, D.C., and then we take our fight for social, economic, racial and environmental justice to Philadelphia."