What is the best explanation for the origin of the new world monkeys?

The best explanation for the origin of New World monkeys (platyrrhines) is that they evolved from a common ancestor that migrated from Africa to South America approximately 35 million years ago. This migration likely occurred via a land bridge or through floating vegetation. Once in South America, these ancestral primates underwent adaptive radiation, leading to the diverse species of New World monkeys we see today. Their distinct features, such as prehensile tails and flat noses, evolved in response to their unique environments.