On November 19, Argentina held a run-off presidential election. Javier Milei, nominee of the Libertad Avanza, won with 55%. In the initial round, he had placed second in a five-candidate field with 30%. See the wikipedia article on the election.

Libertad Avanza (Liberty Advances) was running in its first presidential election. It had been formed in 2019 and contested the legislative elections that year.

Other nations in which a new party elected its presidential nominee in recent years have been Ukraine, France, and Mexico.

In the United States, one must go all the way back to 1860 to find an instance when a new party won a presidential election, and even then, the Republican Party was six years old when it won its first presidential election.

In Florida, the major parties, the only ones who have presidential primaries, have complete control over which candidates appear on the ballot. See this article about the eight Republicans who will be on the Florida Republican presidential primary: Ryan Binkley, Doug Burgum, Chris Christie, Ron DeSantis, Nikki Haley, Asa Hutchinson, Vivek Ramaswamy, and Donald Trump.

The Republicans let anyone who paid the party $25,000, and who promised to appear at a statewide party rally. Also anyone who did not appear at the rally could get on with $100,000.

Utah held a special election on November 21 to fill the vacancy in the Second District. The results: Republican 57.35%; Democratic 33.73%; Libertarian 2.66%; Constitution 2.17%; United Utah 1.79%; independent Perry Myers 1.42%; independent Joe Buchman .84%. See the full results here.

When this seat was last up, in November 2022, the percentages had been: Republican 59.71%; Democratic 34.01%; United Utah 3.32%; Constitution 2.96%.