New York: Billionaire Australian businessman Anthony Pratt has received a standing ovation from US President Donald Trump after pledging $US2 billion ($2.7 billion) in investment in the US.

Mr Pratt made the announcement at the 75th anniversary of the Battle of the Coral Sea event in New York.

Billionaire Anthony Pratt bet heavily on Donald Trump to win the US election. Credit:Louie Douvis

Mr Pratt, during a speech on stage, told Mr Trump he was making the decision because the President had made "America the greatest place in the world to manufacture".

"Tonight I'd like to pledge another $US2 billion over the next 10 years doubling our rate of investment to create an additional 5000 high paying manufacturing jobs mainly in the midwest," Mr Pratt, who was seated beside First Lady Melania Trump at the dinner, said.