Final answer:
Alexander the Great established city-states and libraries in the territories he conquered.
Step-by-step explanation:
Once Alexander the Great conquered a territory, he would often establish city-states to help maintain control and facilitate administration. These city-states served as political and administrative centers, and were typically built around citadels or fortified areas. Examples of city-states established by Alexander the Great include Alexandropolis in Egypt and Alexandria in India. In addition to city-states, Alexander also established libraries in the conquered territories, such as the famous Library of Alexandria, which became a center of learning and knowledge.
Learn more about Alexander the Great's establishment of city-states and libraries