Answer:Civilizations expand through trade, conflict, and exploration. Usually, all three elements must be present for a civilization to grow and remain stable for a long period of time. The physical and human geography of Southeast Asia allowed these attributes to develop in the Khmer civilization, for example.
Explanation:
Explanation:
Textbooks
Literature reviews and review articles (e.g., movie reviews, book reviews
Biographical works
Reference books, including dictionaries, encyclopedias, and atlases
History books and other popular or scholarly books
Commentaries and treatises
The undreground railroads
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