Luis Rodolfo Abinader has been sworn in as president of the Dominican Republic following his election win last month.
The 53-year-old businessman, who had never held elected office, won a four-year term on July 5, ending a 16-year run in power by a centre-left party.
He had finished second in the 2016 presidential election.
US Secretary of State Mike Pompeo was among the attendees at Sunday's swearing-in ceremony in Santo Domingo.
His trip came two days after the Dominican Republic was the only country on the 15-member UN security council to support a US resolution to indefinitely extend an arms embargo against Iran.
"This election resounds as an example to other nations of the power of democracy and what is possible when countries prioritize the wishes of their people," Pompeo tweeted after Abinader's inauguration, saying he was "optimistic about this chapter in US-Dominican partnership".
The elections in the Dominican Republic took place as the coronavirus pandemic was sweeping across the Caribbean nation of some 10.5 million people.
Abinader himself had spent weeks before the election in isolation following a positive test for the virus, and the vote itself had been postponed from May due to COVID-19.