Answer:
They were colonized by different countries. Mainly Spain, France and Portugal.
Explanation:
The reason for the large differences in demographics has to do with the fact that there were different countries that colonized the various regions.
Spain originally colonized the Caribbean,Central America and many parts of South America while Portugal colonized what is now known as Brazil.
Eventually France became involved and had control of the Caribbean and Central America for a while.
This is why there is some French and some Spanish spoken in the islands. Central America and the majority of South America still speak Spanish.
Other factors in the demographics include the native inhabitants of the regions and their appearance along with the slaves brought from countries outside of those regions.
