The Khmer Kingdom rose to power about 1,200 years ago in Southeast Asia. It ruled over a large area that included modern-day Cambodia and parts of Thailand, Laos, and Vietnam. This wide control helped the Khmer trade with nearby regions and grow strong.
One of the main reasons the Khmer became powerful was their skill at controlling water. The land had heavy rains during part of the year and long dry seasons. To solve this, the Khmer built huge canals and reservoirs to store rainwater and use it later. This allowed farmers to grow large amounts of rice, which fed many people and helped cities grow large and wealthy.
With plenty of food, the population increased, and Khmer kings could raise large armies. The Khmer also used war elephants, which were trained to charge into battle, scare enemies, and break enemy lines. Some elephants carried soldiers or archers on their backs. War elephants became a symbol of power and strength.
Khmer kings believed they were chosen by the gods, which helped unite the people under one ruler. With smart water systems, strong armies, and powerful leaders, the Khmer Kingdom became one of the greatest empires in Southeast Asia.