Prince William, Kate visit Boston startup, charity on day 2 of visit

Prince William thanked the "people of Boston" as he and his wife Kate arrived in the city to kick off their first U.S. tour in nearly a decade.

William and Kate are visiting Boston to attend the second annual awards ceremony for the Earthshot Prize, an initiative William launched in 2019 to create solutions for environmental problems.

This is William and Kate's first visit to the United States since they visited New York City in 2014. It is also their first overseas trip since the death of Queen Elizabeth II in September and their first overseas trip since taking on the titles of Prince and Princess of Wales.

"[William and Kate] are both excited for their first international trip since taking on their new roles," a Kensington Palace spokesperson told ABC News ahead of the trip. "Both appreciate the history associated to the titles but understandably want to look to the future and pave their own paths."