Why isn't Latin America fully recognized as part of the Western world? It's strange.

As you know,
Latin America was also founded by ethnic groups that migrated from Europe.
There are even Americans in Brazil.
Is it because they are not part of the Anglosphere, i.e., English-speaking countries?
If we follow that logic, it's a bit hard to understand why South Africa, where white people also reside, isn't categorized similarly.