You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Indigenous_peoples_of_the_Americas

Context:
The data indicate that the individual was from a population directly ancestral to present South American and Central American Native American populations, and closely related to present North American Native American populations. The implication is that there was an early divergence between North American and Central American plus South American populations. Hypotheses which posit that invasions subsequent to the Clovis culture overwhelmed or assimilated previous migrants into the Americas were ruled out.

Question:
Theories that there were invasions which overwhelmed or assimilated previous migrants into the Americas have been what?

ruled out