The Incas were a highly advanced civilization that flourished in South America from the early 15th century until the Spanish conquest in the 16th century. Known for their impressive architectural achievements, extensive road systems, and sophisticated agricultural practices, the Incas established a vast empire that stretched along the western coast of South America, primarily in present-day Peru. Their societal organization and unique cultural practices played a crucial role in shaping the history of the region during this transformative period.