No nation from CONCACAF, the governing body for football in North and Central America and the Caribbean, has hosted the tournament since the United States in 1994.
"The United States, Mexico and Canada have individually demonstrated their exceptional abilities to host world-class events," said US Soccer Federation president Sunil Gulati.
"When our nations come together as one, as we will for 2026, there is no question the United States, Mexico and Canada will deliver an experience that will celebrate the game and serve players, supporters and partners alike."
He said: "From a social perspective, it's a positive. This is a symbol of what we can do to unify people."
Gulati later added on Twitter that US President Donald Trump was supportive of the bid.
Read the full article on eurosport.co.uk: USA, Mexico and Canada announce 2026 World Cup bid