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:
Ecuador was the site of many indigenous cultures, and civilizations of different proportions. An early sedentary culture, known as the Valdivia culture, developed in the coastal region, while the Caras and the Quitus unified to form an elaborate civilization that ended at the birth of the Capital Quito. The Cañaris near Cuenca were the most advanced, and most feared by the Inca, due to their fierce resistance to the Incan expansion. Their architecture remains were later destroyed by Spaniards and the Incas.

Question:
What two cultures unified to for an elaborate civilization?

the Caras and the Quitus