The 32-year-old insists he turned down the chance for even higher wages and admits David Beckham played a part in helping him to make the switch to America
The former Brazil international had his contract with Italian giants AC Milan terminated by mutual consent on Monday before the Florida-based outfit confirmed the signing of the 32-year-old a day later.
Kaka – who had one year left on his deal at the San Siro – became Orlando City's first designated player when he signed for the club.
And the Brazilian has now revealed that he turned down more lucrative offers elsewhere to help football grow as a sport in the United States.
"At the end of last season, I started to think about my future and whether I would go back to play in Brazil, [play in] the USA or stay at Milan," he said.
"It was difficult to leave Milan [but] my expectation is that soccer is going to become the number one sport in the USA.
"They pay me good [money] but I had another opportunity to earn more money. I always think about the project.
"I stayed in Milan for six years, I stayed in Madrid for four years, I played in Brazil for nine years so I always think about the good projects.
"They pay me good money but I could earn more elsewhere."
With the new MLS season set to begin in 2015, Kaka will first return to his boyhood side Sao Paulo on loan to maintain his fitness before starting the next chapter of his career in America.
The Brazil playmaker only re-joined Milan last summer after a four-year spell at Real Madrid but endured an unsuccessful campaign back in Serie A.
Kaka - who won league titles in Spain and Italy as well as the Champions League with Milan and the World Cup with Brazil - revealed that former Rossoneri team-mate David Beckham played a part in helping him to decide to move to the US.
"I think it is the right moment because I'm not too young but I'm not too old. I can still bring a lot to the league, which is getting better," Kaka said.
"I can say I'm studying the league. My brother [Digao] played here and David [Beckham] played. I spoke to him a lot.
"When I start to play, I'll figure out how I can improve the team."