Republican hope for President Donald Trump won the championship in South Carolina, asserting his status as the man to win the GOP nomination.
In the Democratic race, Hillary Clinton defeated Vermont Sen. Bernie Sanders in a close race in Nevada.
Both results will be key before the Super Tuesday round on March 1, when a dozen other countries will make their choice.
Donald Trump’s victory took a big toll when former Florida Gov. Jeb Bush dropped out of the race.
Jeb Bush ended a distant quarter, days after his brother, former President George W. Bush, rarely appeared on a political scale to step up his campaign.
Republican Senators Ted Cruz and Marco Rubio were imprisoned in a battle for second place in the state.
“It’s not easy to run for president,” Donald Trump said at his rally in Spartanburg on Saturday night.
“It’s hard, it sucks, it means it’s evil. It’s beautiful – when you win, it’s beautiful. “
Donald Trump’s supporters erupted at his campaign headquarters when the forecast results were announced.
His campaign has sparked controversy, with his latest debate with Pope Francis over Christian values making headlines this week.
Thousands of miles to the west, Hillary Clinton narrowly defeated Bernie Sanders, who defeated her convincingly in New Hampshire in their last race.
“Some may have doubted us, but we have never doubted each other.” Hillary Clinton told her supporters at a victory rally in Las Vegas.
“This is your campaign.”
The battle between them has intensified in recent weeks, with Hillary Clinton expected to win Nevada by two figures just weeks ago.
However, Ted Cruz, who has successfully responded to young voters with calls for free university education, appears to have performed better than expected among Spaniards in Nevada.
According to NBC’s initial polls, Bernie Sanders won among Spaniards with 53% of the vote, but lost among black voters, who won only 22% of the vote.
Hillary Clinton’s next test will be at the Democrat Championships in South Carolina on February 27. Republicans will hold their own parties in Nevada on Feb. 23.
After each state votes in primaries or caucuses, delegates won by each party candidate will continue to approve them at party congresses in July.