U.S. President Donald Trump's declaration in an inauguration speech that Americans “split the atom” prompted vexed social media posts on Tuesday by New Zealanders, who said the achievement belonged to a pioneering scientist revered in his homeland.

The tale of splitting the atom isn't just about America—it's a journey from New Zealand to Manchester, led by the brilliant mind of Ernest Rutherford, the true father of nuclear physics.

Donald Trump angered New Zealanders on his first day in office when he asserted that America split the atom, something that Sir Ernest Rutherford accomplished.

After President Trump's claim, a mayor in New Zealand pointed out that work to split the atom was actually pioneered by physicist Ernest Rutherford.

Physicists from both New Zealand and Britain have been credited with splitting the atom — but there is consensus that it was not an American.

A New Zealand mayor has invited the American ambassador for a history lesson, after US President Donald Trump appeared to imply it was the US that split the atom – which it is not alone in and certainly wasn't the first to do. During Trump's inauguration, he listed off a number of achievements by Americans in the past.

Recommended Videos The achievement is also credited to English scientist John Douglas Cockroft and Ireland's Ernest Walton, researchers in 1932 at a British laboratory developed by Rutherford.