What is the most successful Eurovision song from the US?

As the Eurovision Song Contest is a competition between European countries, the United States has never officially participated in the event. Therefore, there is no Eurovision song from the US that can be considered the most successful.

However, several countries outside of Europe have participated in the contest as guest performers, including Australia in recent years. In fact, Australia has been one of the most successful guest performers in the competition, with their best result being a second-place finish in 2016 with the song 'Sound of Silence' by Dami Im.

While the US has never competed in Eurovision, the country has hosted the American Song Contest, a similar competition that will debut in 2022. It will feature artists representing each of the 50 states and five US territories competing for the title of best original song.