The correct answer to this open question is the following.
North America was primarily Protestant, while Latin America became Catholic due to the following reasons.
It was the Spanish conquerors who colonized most parts of Latin America. After Christopher Columbus discovered America on October 12, 1492, the Spanish monarchy sent Spanish conquerors to colonize the Americas and the Mesoamerican civilizations such as the Aztecs. In South America, they did the same with empires such as the Inca, in Perú.
The Spanish were Catholics and they sent catholic congregations to evangelize the Native Indians. That is why most Latin America profess Catlolicis.
In the case of North America, this territory was colonized first by people from Great Britain that professed teh Protestant religion of the Church of England. The first colony they found in the North American territory was Jamestown, Virginia in 1607. In 1620, English people like the Puritans arrived at the North American territory to live their religious beliefs. That is why most of the United States profess some form of the Protestant religion.