The 인카 제국 (Inca Empire) was a powerful civilization that thrived in the Andean region of South America from the early 15th century until the Spanish conquest in the 16th century. It was known for its advanced agricultural techniques, impressive architecture, and extensive road systems that connected various parts of the empire. The capital city was 쿠스코, which served as the political and cultural center. The Inca society was organized into a hierarchical structure, with the 수파 인카 (Sapa Inca) at the top as the emperor. The empire was renowned for its achievements in engineering, including the construction of 마추픽추, a famous archaeological site. The Incas also had a unique system of record-keeping using 키푸, a series of knotted strings.