When did the first Americans arrive?

This video is about an explanation of how scientists thought the first Americans arrive, so the first thinking was that there was a time when all part of the Americas was covered by ice creating a hard surface making it possible for people from Asia to walk from there over here, that fact was explained by an archeologist; but because of some things found in Cabo Verde (Chile) that said those people arrived earlier than what they thought, it makes them wonder how was that possible because what they have from their investigations don’t match with the results found, leaving them with no precise information about the first Americans arrival and so many questions without exact answers.

They hope the answer will be found in the future but now they don’t have it, they just have some incomplete and maybe some possible answers for that question.