Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This empire's fortress of Sacsahuaman was built with precisely-fitted stone blocks carried across large distances without wheeled vehicles. This empire absorbed the Chimu civilization, and its records and messages were kept on elaborate knotted strings called quipus. It reached its height under Huayna Capac, and that ruler's decision to divide this empire between Huascar and (*) Atahualpa led to a civil war that weakened this empire shortly before the arrival of Francisco Pizarro. For 10 points, name this South American empire located in present-day Peru.
A:
History